logic
=====

Logical constructions and theorems, beyond what has already been
declared in init.datatypes and init.logic.

The command `import logic` does not import any axioms by default.

* [connectives](connectives.lean) : the propositional connectives
* [eq](eq.lean) : additional theorems for equality and disequality
* [cast](cast.lean) : casts and heterogeneous equality
* [quantifiers](quantifiers.lean) : existential and universal quantifiers
* [identities](identities.lean) : some useful identities
* [default](default.lean)

Subfolders:

* [examples](examples/examples.md)
