ZeroToLean/Index.md

Basic logic

Name	Mathlib equivalent	Proposition
basicLogic.and_commutative	and_comm	a\land b \iff b \land a
basicLogic.or_commutative	or_comm	a\lor b \iff b \lor a
basicLogic.double_negation	not_not_intro	a\to\neg\neg a
basicLogic.and_associative	and_assoc	a\land (b\land c) \iff (a\land b) \land c
basicLogic.contrapositive	contrapose	(a \to b) \to (\neg b \to \neg a)