<\body> The following commands can be used for performing dynamic computations: <\description> >sequential or of two conditions. >exclusive or of two conditions. >sequential and of two conditions. >negation of a condition. >add two numbers or lengths. >subtract two numbers or lengths. >multiply two numbers. >divide two numbers. >concatenate two strings. >display a number in Arabic, roman, Roman, alpha or Alpha (used for instance in enumerations). >>translate a word from a source language into a destination language (see the dictionaries in ). >test equality. >test inequality. >insert an if statement with an optional else part. <\initial> <\collection>