Mutual Induction
The Scheme command is used to generate mutual induction principals.
http://pauillac.inria.fr/pipermail/coq-club/2007/002980.html excellent Coq-club post by Xavier Leroy explains best practices for mutual induction in Coq.
See also the Coq Reference Manual's http://coq.inria.fr/doc/Reference-Manual010.html#toc60 and http://coq.inria.fr/doc/Reference-Manual012.html#Scheme-examples.
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