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  • 3
    \$\begingroup\$ I don't think you can make lemmas though \$\endgroup\$ Commented Sep 26, 2017 at 23:37
  • 11
    \$\begingroup\$ "Theorem. -a*-a=0" should be =a*a ? \$\endgroup\$ Commented Sep 27, 2017 at 0:39
  • 2
    \$\begingroup\$ @H.PWiz I don't have a problem with people using lemmas, but they cost as many steps as they are long each time they are used. I would recommend against using them because they can get in the way of optimizations, but as far as I'm concerned this post is fine. \$\endgroup\$ Commented Sep 27, 2017 at 2:14
  • 4
    \$\begingroup\$ going from "0 + -(a*b)" to "-(a*b)" in a single application of axiom 2 is not right. you need to use axiom 4 to swap the sides of the + first. \$\endgroup\$ Commented Sep 27, 2017 at 6:20
  • 2
    \$\begingroup\$ The way I read it is lemma 2/3 are 6 steps plus an instance of lemma 1 for 12 steps, lemma 4 is 6 steps, for a total of 30 steps. Am I missing something here? \$\endgroup\$ Commented Sep 29, 2017 at 13:27