FormalSAT / trestle

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Added subst lemmas, graph coloring example #15

Closed ccodel closed 6 months ago

ccodel commented 6 months ago

A bunch of lemmas were added to Model/Subst.lean, and the example file from the Formal Cookies talk was added to the Examples/ folder.

Notes: compare substL (line 151) to subst (line 185), and see the TODO on line 219.

Better notation/syntax? See lines 49-53.