6 In particular, there are \isa{case}-expressions, for example
10 case\ \mbox{n}\ of\ \isadigit{0}\ {\isasymRightarrow}\ \isadigit{0}\ {\isacharbar}\ Suc\ \mbox{m}\ {\isasymRightarrow}\ \mbox{m}
14 primitive recursion, for example%
16 \isacommand{consts}\ sum\ {\isacharcolon}{\isacharcolon}\ {\isachardoublequote}nat\ {\isasymRightarrow}\ nat{\isachardoublequote}\isanewline
17 \isacommand{primrec}\ {\isachardoublequote}sum\ \isadigit{0}\ {\isacharequal}\ \isadigit{0}{\isachardoublequote}\isanewline
18 \ \ \ \ \ \ \ \ {\isachardoublequote}sum\ {\isacharparenleft}Suc\ n{\isacharparenright}\ {\isacharequal}\ Suc\ n\ {\isacharplus}\ sum\ n{\isachardoublequote}%
19 \begin{isamarkuptext}%
21 and induction, for example%
23 \isacommand{lemma}\ {\isachardoublequote}sum\ n\ {\isacharplus}\ sum\ n\ {\isacharequal}\ n{\isacharasterisk}{\isacharparenleft}Suc\ n{\isacharparenright}{\isachardoublequote}\isanewline
24 \isacommand{apply}{\isacharparenleft}induct{\isacharunderscore}tac\ n{\isacharparenright}\isanewline
25 \isacommand{by}{\isacharparenleft}auto{\isacharparenright}\isanewline
29 %%% TeX-master: "root"