mirror of https://github.com/texmacs/doc.git
81 lines
3.8 KiB
Tcl
81 lines
3.8 KiB
Tcl
<TeXmacs|1.0.7.9>
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<style|tmdoc>
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<\body>
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<tmdoc-title|Typing large delimiters>
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Brackets inside mathematical formulas should always match: as soon as you
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enter an opening bracket ``(<math|>'', <TeXmacs> will automatically insert
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the matching closing bracket ``<math|>)''. You may disable this feature
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using <menu|Edit|Preferences|Keyboard|Automatic brackets|Disable>.
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Attention (see also below): brackets in old documents will be automatically
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upgraded to matching brackets.
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Sometimes, you do not want the closing bracket, or you may want to replace
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it by another closing bracket. No problem: if your cursor is just before
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the closing bracket inside <math|<around|(|a,b<value|cursor>|)>>, then
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pressing<nbsp><key|]> will turn the expression into
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<math|<around|(|a,b|]><value|cursor>>. Alternatively, deletion of a bracket
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will actually turn it into an <hlink|invisible
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bracket|../semantics/man-semantics-symbols.en.tm#nobracket>, after which
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you can replace it by an arbitrary opening or closing bracket.
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By default, the sizes of the brackets are adjusted to the expression
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between the brackets. Small delimiters, which are created using the
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<prefix|math:small>-prefix, keep their sizes independently of the enclosed
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expression. Alternatively, you may use <shortcut|(alternate-toggle
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(focus-tree))> in order to toggle between large and small delimiters.
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For some delimiters, such as <math|\|>, the opening and closing delimiters
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coincide. For instance, entering a vertical bar <key|\|> will produce an
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absolute value. The (small) bar-separator <math|\|> is obtained using
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<shortcut|\|>, or as a variant using <key|\| var>. The big bar-separator is
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entered using <shortcut|(math-separator "\|" #t)>. In <TeX> and <LaTeX>,
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such large separators do not exist; they are used for producing the
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vertical bars in formulas like
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<\equation*>
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<around*|\<langle\>|<frac|a|b+c><mid|\|><frac|p|q+r><mid|\|><frac|a|b+c>|\<rangle\>>.
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</equation*>
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There may be as many middle delimiters between a left and a right delimiter
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as one wishes. Notice that there are still another number of variants of
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vertical bars. For instance, the binary relation ``divides'' is entered
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using <shortcut|\<divides\>> or <key|\| var var var var>.
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In <TeXmacs>, large delimiters may either be ``left delimiters'', ``right
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delimiters'' or ``middle delimiters''. By default, <math|(,[,{> and
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<math|\<langle\>> are left delimiters, <math|),],}> and <math|\<rangle\>>
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are right delimiters. But there status can be changed using the
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<prefix|math:left>, <prefix|math:right> and <prefix|math:middle> key
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combinations. For instance, <key|math:left )> produces <math|)>, considered
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as a large left delimiter.
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Sometimes you may want large delimiters of a particular size, instead of
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self-adjusting ones. This can be achieved by resizing the expression in
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between the brackets using the items in <menu|Format|Adjust>.
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Notice that it is possible to insert a pair of invisible brackets using
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<shortcut|(math-bracket-open "." "." #t)>. This is for instance useful in
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computational contexts, in which formulas should admit a precise, not
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merely visual semantics. Alternatively, one may put the formula inside a
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``rigid box'' using<nbsp><shortcut|(make-rigid)>, which additionally
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prevents the formula from being hyphenated.
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<tmdoc-copyright|1998--2010|Joris van der Hoeven>
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<tmdoc-license|Permission is granted to copy, distribute and/or modify this
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document under the terms of the GNU Free Documentation License, Version 1.1
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or any later version published by the Free Software Foundation; with no
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Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
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Texts. A copy of the license is included in the section entitled "GNU Free
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Documentation License".>
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</body>
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<\initial>
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<\collection>
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<associate|language|english>
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</collection>
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</initial>
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