feat(06_Inductive_Types): add heterogeneous equality and section on automatically generated constructions
feat(06_Inductive_Types): add heterogeneous equality and section on
automatically generated constructions

soonhokong/lean-tutorial,cjmazey/fork_leanprover_tutorial,Hodapp87/cs6460_project,fpvandoorn/tutorial,leanprover/tutorial,soonhokong/lean-tutorial,fpvandoorn/tutorial,avigad/tutorial,cjmazey/fork_leanprover_tutorial,leanprover/tutorial,leanprover/tutorial,cjmazey/fork_leanprover_tutorial,avigad/tutorial,fpvandoorn/tutorial,soonhokong/lean-tutorial,avigad/tutorial,Hodapp87/cs6460_project,Hodapp87/cs6460_project