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Put all progress reports in one place on master
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dylanrichardson committed Dec 3, 2018
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Changelog for jkstpierre:

11/20/2018:
- Proved with Professor Dougherty that substitutions
distribute. This was the final link required for
connecting the fundamental idea behind unification,
namely that "sigma" being a unifier for terms "t1, t2"
if (sigma t1) = (sigma t2) is equivalent to saying
(sigma t) = 0 for some term t.
- Wrote functions for evaluating ground terms to 0 or 1.
- Wrote definition for a more general substitution.
- Wrote definition for a most general unifier.
- Proved an example from the book for being a most
general unifier.
- Wrote preliminary definitions for Lowenheim's formula.
- Wrote auxilliary helpers for variable membership in
terms.

11/21/2018:
- Wrote some tentative examples for Lowenheim's formula
checking to see if it is generating mgu's.
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