diff --git a/SICP/index.tm b/SICP/index.tm
index d1aa474..f748064 100644
--- a/SICP/index.tm
+++ b/SICP/index.tm
@@ -24,6 +24,10 @@
       <item>\<#76EE\>\<#6807\>\<#90AE\>\<#7BB1\>\<#FF1A\>shenda AT ustc.edu
     </itemize>
 
+    <item>\<#7B2C\>11\<#8BFE\>\<#FF1A\>\<#7B26\>\<#53F7\>\<#6570\>\<#636E\>\<#548C\>\<#7B26\>\<#53F7\>\<#6C42\>\<#5BFC\>
+
+    \<#8BFE\>\<#4EF6\>\<#FF1A\><hlink|\<#5E7B\>\<#706F\>\<#7247\>11|slide11.tm>
+
     <item>\<#7B2C\>10\<#8BFE\>\<#FF1A\>\<#51FD\>\<#6570\>\<#5F0F\>\<#7F16\>\<#7A0B\>\<#4E09\>\<#677F\>\<#65A7\>
 
     \<#8BFE\>\<#4EF6\>\<#FF1A\><hlink|\<#5E7B\>\<#706F\>\<#7247\>10|slide10.tm>
diff --git a/SICP/slide11.tm b/SICP/slide11.tm
new file mode 100644
index 0000000..3fe1566
--- /dev/null
+++ b/SICP/slide11.tm
@@ -0,0 +1,721 @@
+<TeXmacs|2.1.2>
+
+<style|<tuple|beamer|no-page-numbers|chinese|python|s7|maxima>>
+
+<\body>
+  <\hide-preamble>
+    <assign|dfn|<macro|x|<strong|<arg|x>>>>
+  </hide-preamble>
+
+  <\slideshow>
+    <\slide>
+      \;
+
+      \;
+
+      \;
+
+      <doc-data|<doc-title|\<#96F6\>\<#57FA\>\<#7840\>SICP
+      11>|<doc-author|<author-data|<author-name|>>>|<doc-author|<author-data|<author-name|\<#6C88\>\<#6D6A\>\<#718A\>\<#732B\>\<#513F\>>>>|<doc-author|<author-data|<author-name|MathAgape>|<\author-affiliation>
+        \;
+
+        \;
+
+        \;
+
+        \;
+
+        \;
+
+        \;
+
+        \;
+      </author-affiliation>>>|<doc-subtitle|\<#7B26\>\<#53F7\>\<#6570\>\<#636E\>\<#548C\>\<#7B26\>\<#53F7\>\<#6C42\>\<#5BFC\>>>
+    </slide>
+
+    <\slide>
+      <tit|\<#96F6\>\<#57FA\>\<#7840\>SICP\<#FF1A\>\<#7B2C\>11\<#8BFE\>>
+
+      <\wide-tabular>
+        <tformat|<cwith|2|-1|1|-1|cell-height|40px>|<cwith|2|-1|1|-1|cell-vmode|exact>|<table|<row|<\cell>
+          <\large>
+            <strong|\<#6570\>\<#636E\>\<#62BD\>\<#8C61\>\<#5BFC\>\<#5F15\>>
+          </large>
+        </cell>|<\cell>
+          <\large>
+            <strong|Introduction to Data Abstraction>
+          </large>
+        </cell>>|<row|<\cell>
+          \;
+        </cell>|<\cell>
+          \;
+        </cell>>|<row|<\cell>
+          <large|<strong|\<#5C42\>\<#6B21\>\<#6027\>\<#6570\>\<#636E\>\<#548C\>\<#95ED\>\<#5305\>\<#6027\>\<#8D28\>>>
+        </cell>|<\cell>
+          <large|<strong|Hierarchical Data and the Closure Property>>
+        </cell>>|<row|<\cell>
+          \;
+        </cell>|<\cell>
+          \;
+        </cell>>|<row|<\cell>
+          <large|<strong|\<#7B26\>\<#53F7\>\<#6570\>\<#636E\>>>
+        </cell>|<\cell>
+          <large|<strong|Symbolic Data>>
+        </cell>>|<row|<\cell>
+          \<#5F15\>\<#53F7\>
+        </cell>|<\cell>
+          Quotation
+        </cell>>|<row|<\cell>
+          \<#5B9E\>\<#4F8B\>\<#FF1A\>\<#7B26\>\<#53F7\>\<#6C42\>\<#5BFC\>
+        </cell>|<\cell>
+          Example: Symbolic Differentiation
+        </cell>>>>
+      </wide-tabular>
+
+      \;
+
+      \<#56DE\>\<#987E\>\<#FF1A\>\<#901A\>\<#8FC7\>\<#5B9A\>\<#4E49\>\<#4E00\>\<#7EC4\><strong|\<#903B\>\<#8F91\>\<#81EA\>\<#6D3D\>>\<#7684\>\<#9009\>\<#62E9\>\<#51FD\>\<#6570\>\<#548C\>\<#6784\>\<#9020\>\<#51FD\>\<#6570\>\<#FF0C\>\<#5B9A\>\<#4E49\>\<#6570\>\<#636E\>\<#3002\>
+
+      \;
+    </slide>
+
+    <\slide>
+      <tit|\<#56DE\>\<#987E\>\<#FF1A\>\<#8BED\>\<#6CD5\>\<#7CD6\>\<#8863\>>
+
+      \<#7279\>\<#6B8A\>\<#5F62\>\<#5F0F\>\<#4E0D\>\<#7B26\>\<#5408\>\<#5E94\>\<#7528\>\<#5E8F\>\<#6C42\>\<#503C\>\<#FF0C\>\<#6BD4\>\<#5982\><scm|define>\<#FF0C\><scm|cond>\<#FF0C\><scm|if>\<#FF08\>\<#96F6\>\<#57FA\>\<#7840\>SICP\<#7B2C\>\<#4E00\>\<#8BB2\>\<#7684\>\<#5185\>\<#5BB9\>\<#FF09\>
+
+      <\session|s7|default>
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (define (myabs x) (if (\<gtr\> x 0) x (- x)))
+        <|folded-io>
+          myabs
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (myabs -1)
+        <|folded-io>
+          1
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          ((lambda (x) (if (\<gtr\> x 0) x (- x))) -1)
+        <|folded-io>
+          1
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          -1
+        <|folded-io>
+          -1
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (- 1)
+        <|folded-io>
+          -1
+        </folded-io>
+
+        <\input>
+          \<gtr\>\ 
+        <|input>
+          (list? )
+        </input>
+      </session>
+
+      \<#5373\>\<#4F7F\>\<#6211\>\<#4EEC\>\<#7684\>Scheme\<#89E3\>\<#91CA\>\<#5668\>\<#4E0D\>\<#652F\>\<#6301\><scm|-1>\<#FF0C\><scm|define>\<#FF0C\>\<#6211\>\<#4EEC\>\<#4E5F\>\<#53EF\>\<#4EE5\>\<#4F7F\>\<#7528\>\<#66F4\>\<#52A0\>\<#7E41\>\<#7410\>\<#7684\>\<#8BED\>\<#6CD5\>\<#6765\>\<#8868\>\<#793A\>\<#540C\>\<#6837\>\<#7684\>\<#542B\>\<#4E49\>\<#3002\>\<#8BED\>\<#6CD5\>\<#7CD6\>\<#8863\>\<#5E76\>\<#6CA1\>\<#6709\>\<#7ED9\>\<#6211\>\<#4EEC\>\<#5E26\>\<#6765\>\<#65B0\>\<#7684\>\<#80FD\>\<#529B\>\<#FF0C\>\<#4F46\>\<#80FD\>\<#5E2E\>\<#52A9\>\<#6211\>\<#4EEC\>\<#7B80\>\<#5316\>\<#4EE3\>\<#7801\>\<#3002\>
+
+      \<#5229\>\<#7528\>\<#5B8F\>\<#7F16\>\<#7A0B\>\<#7684\>\<#7279\>\<#6027\>\<#FF0C\>\<#6211\>\<#4EEC\>\<#53EF\>\<#4EE5\>\<#81EA\>\<#5B9A\>\<#4E49\>\<#8BED\>\<#6CD5\>\<#7CD6\>\<#8863\>\<#3002\>
+    </slide>
+
+    <\slide>
+      <tit|\<#5B9A\>\<#4E49\>\<#7B26\>\<#53F7\>\<#6570\>\<#636E\>\V\<#6784\>\<#9020\>\<#51FD\>\<#6570\>quote>
+
+      <marked|<scm|'>>\<#662F\>\<#4E00\>\<#79CD\>\<#8BED\>\<#6CD5\>\<#7CD6\>\<#8863\>\<#FF0C\>\<#5982\>\<#679C\>\<#6CA1\>\<#6709\><marked|<scm|'>>\<#FF0C\>\<#4E5F\>\<#53EF\>\<#4EE5\>\<#4F7F\>\<#7528\><scm|quote>\<#3002\>Scala\<#91CC\>\<#9762\>\<#4E5F\>\<#6709\>\<#7B26\>\<#53F7\>\<#6570\>\<#636E\>\<#3002\>SRFI-1
+      List
+
+      <\with|par-columns|2>
+        <\session|s7|default>
+          <\folded-io>
+            \<gtr\>\ 
+          <|folded-io>
+            'a
+          <|folded-io>
+            a
+          </folded-io>
+
+          <\folded-io>
+            \<gtr\>\ 
+          <|folded-io>
+            (quote a)
+          <|folded-io>
+            a
+          </folded-io>
+
+          <\folded-io>
+            \<gtr\>\ 
+          <|folded-io>
+            ''a
+          <|folded-io>
+            'a
+          </folded-io>
+
+          <\folded-io>
+            \<gtr\>\ 
+          <|folded-io>
+            (quote (quote a))
+          <|folded-io>
+            'a
+          </folded-io>
+
+          <\folded-io>
+            \<gtr\>\ 
+          <|folded-io>
+            '1
+          <|folded-io>
+            1
+          </folded-io>
+
+          <\folded-io>
+            \<gtr\>\ 
+          <|folded-io>
+            (eq? 1 (quote 1))
+          <|folded-io>
+            #f
+          </folded-io>
+
+          <\folded-io>
+            \<gtr\>\ 
+          <|folded-io>
+            '#t
+          <|folded-io>
+            #t
+          </folded-io>
+
+          <\folded-io>
+            \<gtr\>\ 
+          <|folded-io>
+            (eq? #t `#t)
+          <|folded-io>
+            #t
+          </folded-io>
+
+          <\folded-io>
+            \<gtr\>\ 
+          <|folded-io>
+            '+
+          <|folded-io>
+            +
+          </folded-io>
+
+          <\folded-io>
+            \<gtr\>\ 
+          <|folded-io>
+            (eq? + '+)
+          <|folded-io>
+            #f
+          </folded-io>
+
+          <\folded-io>
+            \<gtr\>\ 
+          <|folded-io>
+            ''
+          <|folded-io>
+            #\<eof\>
+          </folded-io>
+
+          <\input>
+            \<gtr\>\ 
+          <|input>
+            \;
+          </input>
+        </session>
+      </with>
+
+      \<#5B57\>\<#9762\>\<#91CF\>\<#FF08\>literally\<#FF09\>\<#5728\>\<#5F15\>\<#7528\>\<#FF08\>\<#4E24\>\<#6B21\>\<#5F15\>\<#7528\>\<#FF1F\>\<#FF09\>\<#4E4B\>\<#540E\>\<#FF0C\>\<#8FD8\>\<#662F\>\<#5B57\>\<#9762\>\<#91CF\>\<#3002\>\<#7B26\>\<#53F7\>\<#5728\>\<#5F15\>\<#7528\>\<#4E4B\>\<#540E\>\<#FF0C\>\<#5219\>\<#53D8\>\<#6210\>\<#4E86\>\<#7B26\>\<#53F7\>\<#6570\>\<#636E\>\<#3002\>
+
+      \;
+    </slide>
+
+    <\slide>
+      <tit|\<#5B9A\>\<#4E49\>\<#7B26\>\<#53F7\>\<#6570\>\<#636E\>\V\<#9009\>\<#62E9\>\<#51FD\>\<#6570\>unquote>
+
+      <marked|<scm|,>>\<#662F\>\<#4E00\>\<#79CD\>\<#8BED\>\<#6CD5\>\<#7CD6\>\<#8863\>\<#FF0C\>\<#5982\>\<#679C\>\<#6CA1\>\<#6709\><marked|<scm|,>>\<#FF0C\>\<#4E5F\>\<#53EF\>\<#4EE5\>\<#4F7F\>\<#7528\><scm|unquote>\<#3002\>unquote\<#53EA\>\<#80FD\>\<#5728\><marked|<scm|`>>\<#FF08\>quasiquote\<#FF09\>\<#4E0B\>\<#4F7F\>\<#7528\>\<#3002\>
+
+      <\session|s7|default>
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (define a 1)
+        <|folded-io>
+          1
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          a
+        <|folded-io>
+          1
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          'a
+        <|folded-io>
+          a
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (quote a)
+        <|folded-io>
+          a
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          `,a
+        <|folded-io>
+          1
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (quasiquote (unquote a))
+        <|folded-io>
+          1
+        </folded-io>
+      </session>
+
+      \<#8BD5\>\<#8BD1\>\<#FF1A\>quote\<#4E3A\>\<#5F15\>\<#7528\>\<#FF0C\>unquote\<#4E3A\>\<#89E3\>\<#5F15\>\<#7528\>\<#FF0C\>quasiquote\<#4E3A\>\<#51C6\>\<#5F15\>\<#7528\>\<#3002\><marked|<scm|'>>
+      \<#662F\>\<#5F15\>\<#53F7\>\<#FF0C\><marked|<scm|,>>
+      \<#662F\>\<#89E3\>\<#5F15\>\<#53F7\>\<#FF0C\><marked|<scm|`>>
+      \<#662F\>\<#51C6\>\<#5F15\>\<#53F7\>\<#3002\>
+    </slide>
+
+    <\slide>
+      <tit|\<#5B9A\>\<#4E49\>\<#7B26\>\<#53F7\>\<#6570\>\<#636E\>\V\<#53C2\>\<#6570\>\<#4E3A\>\<#5217\>\<#8868\>\<#7684\>\<#6784\>\<#9020\>\<#51FD\>\<#6570\>>
+
+      <\session|s7|default>
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          '(a b c)
+        <|folded-io>
+          (a b c)
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (list 'a 'b 'c)
+        <|folded-io>
+          (a b c)
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          '(a b (c d))
+        <|folded-io>
+          (a b (c d))
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (list 'a 'b (list 'c 'd))
+        <|folded-io>
+          (a b (c d))
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          '(+ 1 2)
+        <|folded-io>
+          (+ 1 2)
+        </folded-io>
+
+        <\input>
+          \<gtr\>\ 
+        <|input>
+          \;
+        </input>
+      </session>
+
+      <\scm-code>
+        ' ; quote
+
+        ` ; quasiquote
+
+        , ; unquote
+      </scm-code>
+    </slide>
+
+    <\slide>
+      <tit|\<#5B9A\>\<#4E49\>\<#7B26\>\<#53F7\>\<#6570\>\<#636E\>\V\<#5728\>\<#5217\>\<#8868\>\<#4E2D\>\<#7406\>\<#89E3\>\<#9009\>\<#62E9\>\<#51FD\>\<#6570\>>
+
+      <\with|par-columns|2>
+        <\session|s7|default>
+          <\folded-io>
+            \<gtr\>\ 
+          <|folded-io>
+            '(+ a 1)
+          <|folded-io>
+            (+ a 1)
+          </folded-io>
+
+          <\folded-io>
+            \<gtr\>\ 
+          <|folded-io>
+            (define a 4)
+          <|folded-io>
+            4
+          </folded-io>
+
+          <\folded-io>
+            \<gtr\>\ 
+          <|folded-io>
+            `(+ ,(+ a 1) 1)
+          <|folded-io>
+            (+ 5 1)
+          </folded-io>
+
+          <\folded-io>
+            \<gtr\>\ 
+          <|folded-io>
+            `(+ ,a 1)
+          <|folded-io>
+            (+ 4 1)
+          </folded-io>
+
+          <\folded-io>
+            \<gtr\>\ 
+          <|folded-io>
+            (eval `(+ ,a 1))
+          <|folded-io>
+            5
+          </folded-io>
+        </session>
+
+        <\equation*>
+          <frac|5+4+0*<around*|(|2-<around*|(|3-<around*|(|6+<frac|4|5>|)>|)>|)>|3<around*|(|6-2|)><around*|(|2-7|)>>
+        </equation*>
+      </with>
+
+      \<#7528\>\<#7B26\>\<#53F7\>\<#6570\>\<#636E\>\<#53EF\>\<#4EE5\>\<#5EF6\>\<#8FDF\>\<#8BA1\>\<#7B97\>\<#8FC7\>\<#7A0B\>\<#3002\>\<#5EF6\>\<#8FDF\>\<#8BA1\>\<#7B97\>\<#8FC7\>\<#7A0B\>\<#FF0C\>\<#53EF\>\<#4EE5\>\<#907F\>\<#514D\>\<#65E0\>\<#6548\>\<#8BA1\>\<#7B97\>\<#548C\>\<#91CD\>\<#590D\>\<#8BA1\>\<#7B97\>\<#3002\>
+
+      <\session|s7|default>
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (define \<#5206\>\<#5B50\> `(+ 5 4 (- 2 (- 3 (+ 6 (/ 4 5))))))
+        <|folded-io>
+          (+ 5 4 (- 2 (- 3 (+ 6 (/ 4 5)))))
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (define \<#5206\>\<#6BCD\> `(* 3 (- 6 2) (- 2 7)))
+        <|folded-io>
+          (* 3 (- 6 2) (- 2 7))
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          `(/ ,\<#5206\>\<#5B50\> ,\<#5206\>\<#6BCD\>)
+        <|folded-io>
+          (/ (+ 5 4 (- 2 (- 3 (+ 6 (/ 4 5))))) (* 3 (- 6 2) (- 2 7)))
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (eval `(/ ,\<#5206\>\<#5B50\> ,\<#5206\>\<#6BCD\>))
+        <|folded-io>
+          -37/150
+        </folded-io>
+      </session>
+
+      \<#FF08\>\<#8FD9\>\<#4E2A\>\<#4F8B\>\<#5B50\>\<#6765\>\<#81EA\>\<#4E8E\>\<#300A\>\<#96F6\>\<#57FA\>\<#7840\>SICP\<#300B\>\<#7B2C\>2.1\<#8BFE\>
+      00:12:00\<#FF09\>
+    </slide>
+
+    <\slide>
+      <tit|\<#7B26\>\<#53F7\>\<#6C42\>\<#5BFC\>>
+
+      <\eqnarray*>
+        <tformat|<table|<row|<cell|<frac|\<mathd\>c|\<mathd\>x>>|<cell|=>|<cell|0>>|<row|<cell|<frac|\<mathd\>x|\<mathd\>x>>|<cell|=>|<cell|1>>|<row|<cell|<frac|d<around*|(|u+v|)>|\<mathd\>x>>|<cell|=>|<cell|<frac|\<mathd\>u|\<mathd\>x>+<frac|\<mathd\>v|\<mathd\>x>>>|<row|<cell|<frac|\<mathd\><around*|(|u*v|)>|\<mathd\>x>>|<cell|=>|<cell|u*<frac|\<mathd\>v|\<mathd\>x>+v*<frac|\<mathd\>u|\<mathd\>x>>>>>
+      </eqnarray*>
+
+      <\remark*>
+        <math|c>\<#662F\>\<#4E00\>\<#4E2A\>\<#5E38\>\<#6570\>\<#6216\>\<#8005\>\<#662F\>\<#4E00\>\<#4E2A\>\<#548C\><math|x>\<#65E0\>\<#5173\>\<#7684\>\<#53D8\>\<#91CF\>\<#3002\>
+      </remark*>
+    </slide>
+
+    <\slide>
+      <tit|\<#7B26\>\<#53F7\>\<#6C42\>\<#5BFC\>\V\<#5E94\>\<#7528\>>
+
+      <\session|s7|default>
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (deriv '(+ x 3) 'x)
+        <|folded-io>
+          (+ 1 0)
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (deriv '(* x y) 'x)
+        <|folded-io>
+          (+ (* x 0) (* 1 y))
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (deriv '(* (* x y) (+ x 3)) 'x)
+        <|folded-io>
+          (+ (* (* x y) (+ 1 0)) (* (+ (* x 0) (* 1 y)) (+ x 3)))
+        </folded-io>
+      </session>
+
+      <\session|maxima|default>
+        <\output>
+          Maxima 5.46.0 https://maxima.sourceforge.io
+
+          using Lisp GNU Common Lisp (GCL) GCL 2.6.14 git tag
+          Version_2_6_15pre3
+
+          Distributed under the GNU Public License. See the file COPYING.
+
+          Dedicated to the memory of William Schelter.
+
+          The function bug_report() provides bug reporting information.
+        </output>
+
+        <\folded-io>
+          <with|color|red|(<with|math-font-family|rm|%i>4) >
+        <|folded-io>
+          diff(<math|x+3>)
+        <|folded-io>
+          <math|<with|math-display|true|<text|<with|font-family|tt|color|red|(<with|math-font-family|rm|%o4>)
+          >>d*x>>
+        </folded-io>
+
+        <\folded-io>
+          <with|color|red|(<with|math-font-family|rm|%i>5) >
+        <|folded-io>
+          diff(<math|x*y>,x)
+        <|folded-io>
+          <math|<with|math-display|true|<text|<with|font-family|tt|color|red|(<with|math-font-family|rm|%o5>)
+          >>y>>
+        </folded-io>
+
+        <\folded-io>
+          <with|color|red|(<with|math-font-family|rm|%i>6) >
+        <|folded-io>
+          diff(<math|x*y*<around*|(|x+3|)>>,x)
+        <|folded-io>
+          <math|<with|math-display|true|<text|<with|font-family|tt|color|red|(<with|math-font-family|rm|%o6>)
+          >><around*|(|x+3|)>*y+x*y>>
+        </folded-io>
+
+        <\input>
+          <with|color|red|(<with|math-font-family|rm|%i>7) >
+        <|input>
+          \;
+        </input>
+      </session>
+    </slide>
+
+    <\slide>
+      <tit|\<#7B26\>\<#53F7\>\<#6C42\>\<#5BFC\>\V\<#5B9E\>\<#73B0\>>
+
+      <\session|s7|default>
+        <\unfolded-io>
+          \<gtr\>\ 
+        <|unfolded-io>
+          (define (deriv exp var)
+
+          \ \ (cond ((number? exp) 0)
+
+          \ \ \ \ \ \ \ \ ((variable? exp)
+
+          \ \ \ \ \ \ \ \ \ (if (same-variable? exp var) 1 0))
+
+          \ \ \ \ \ \ \ \ ((sum? exp)
+
+          \ \ \ \ \ \ \ \ \ (make-sum (deriv (addend exp) var)
+
+          \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ (deriv (augend exp) var)))
+
+          \ \ \ \ \ \ \ \ ((product? exp)
+
+          \ \ \ \ \ \ \ \ \ (make-sum
+
+          \ \ \ \ \ \ \ \ \ \ \ (make-product (multiplier exp)
+
+          \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ (deriv
+          (multiplicand exp) var))
+
+          \ \ \ \ \ \ \ \ \ \ \ (make-product (deriv (multiplier exp) var)
+
+          \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ (multiplicand
+          exp))))
+
+          \ \ \ \ \ \ \ \ (else
+
+          \ \ \ \ \ \ \ \ \ (error "unknown expression type -- DERIV" exp))))
+        <|unfolded-io>
+          deriv
+        </unfolded-io>
+      </session>
+    </slide>
+
+    <\slide>
+      <tit|\<#7B26\>\<#53F7\>\<#6C42\>\<#5BFC\>\V\<#57FA\>\<#7840\>\<#51FD\>\<#6570\>>
+
+      <\session|s7|default>
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (define (variable? x) (symbol? x)) ;
+          \<#5224\>\<#65AD\>x\<#662F\>\<#4E0D\>\<#662F\>\<#53D8\>\<#91CF\>
+        <|folded-io>
+          variable?
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (define (same-variable? v1 v2) ;
+          v1\<#548C\>v2\<#662F\>\<#4E0D\>\<#662F\>\<#540C\>\<#4E00\>\<#4E2A\>\<#53D8\>\<#91CF\>
+
+          \ \ (and (variable? v1) (variable? v2) (eq? v1 v2)))
+        <|folded-io>
+          same-variable?
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (define (make-sum a1 a2) (list '+ a1 a2)) ;\ 
+        <|folded-io>
+          make-sum
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (define (make-product m1 m2) (list '* m1 m2))
+        <|folded-io>
+          make-product
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (define (sum? x) (and (pair? x) (eq? (car x) '+))) ;
+          x\<#662F\>\<#548C\>\<#5F0F\>\<#4E48\>\<#FF1F\>
+        <|folded-io>
+          sum?
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (define (addend s) (cadr s)) ; s\<#7684\>\<#88AB\>\<#52A0\>\<#6570\>\<#FF08\>\<#52A0\>\<#53F7\>\<#5DE6\>\<#8FB9\>\<#90A3\>\<#4E2A\>\<#6570\>\<#FF09\>
+        <|folded-io>
+          addend
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (define (augend s) (caddr s)) ;
+          s\<#7684\>\<#52A0\>\<#6570\>\<#FF08\>\<#52A0\>\<#53F7\>\<#53F3\>\<#8FB9\>\<#90A3\>\<#4E2A\>\<#6570\>\<#FF09\>
+        <|folded-io>
+          augend
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (define (product? x) ; x\<#662F\>\<#5426\>\<#662F\>\<#4E00\>\<#4E2A\>\<#4E58\>\<#5F0F\>
+
+          \ \ (and (pair? x) (eq? (car x) '*)))
+        <|folded-io>
+          product?
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (define (multiplier p) (cadr p)) ;
+          p\<#7684\>\<#88AB\>\<#4E58\>\<#6570\>\<#FF08\>\<#4E58\>\<#53F7\>\<#5DE6\>\<#8FB9\>\<#FF09\>
+        <|folded-io>
+          multiplier
+        </folded-io>
+
+        <\folded-io>
+          \<gtr\>\ 
+        <|folded-io>
+          (define (multiplicand p) (caddr p)) ;
+          p\<#7684\>\<#4E58\>\<#6570\>\<#FF08\>\<#4E58\>\<#53F7\>\<#53F3\>\<#8FB9\>\<#FF09\>
+        <|folded-io>
+          multiplicand
+        </folded-io>
+      </session>
+    </slide>
+
+    <\slide>
+      <tit|\<#5C0F\>\<#7ED3\>>
+
+      <\itemize>
+        <item>\<#56DE\>\<#987E\>\<#8BED\>\<#6CD5\>\<#7CD6\>\<#8863\>\<#8FD9\>\<#4E2A\>\<#6982\>\<#5FF5\>
+
+        <item>\<#9488\>\<#5BF9\>\<#539F\>\<#8BED\>\<#8868\>\<#8FBE\>\<#5F0F\>\<#5B9A\>\<#4E49\>\<#7B26\>\<#53F7\>\<#6570\>\<#636E\>
+
+        <item>\<#9488\>\<#5BF9\>\<#590D\>\<#5408\>\<#8868\>\<#8FBE\>\<#5F0F\>\<#5B9A\>\<#4E49\>\<#7B26\>\<#53F7\>\<#6570\>\<#636E\>
+
+        <item>\<#7406\>\<#89E3\>\<#7B26\>\<#53F7\>\<#6570\>\<#636E\>\<#FF1A\>\<#5B9E\>\<#73B0\>\<#5EF6\>\<#8FDF\>\<#8BA1\>\<#7B97\>
+
+        <item>\<#5E94\>\<#7528\>\<#7B26\>\<#53F7\>\<#6570\>\<#636E\>\<#FF1A\>\<#7B26\>\<#53F7\>\<#6C42\>\<#5BFC\>
+      </itemize>
+    </slide>
+  </slideshow>
+</body>
+
+<\initial>
+  <\collection>
+    <associate|info-flag|minimal>
+    <associate|marked-color|pastel yellow>
+    <associate|page-border|attached>
+    <associate|page-medium|paper>
+    <associate|page-offset|1>
+    <associate|page-packet|2>
+    <associate|page-screen-margin|false>
+    <associate|par-columns|1>
+    <associate|preamble|false>
+  </collection>
+</initial>
\ No newline at end of file