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At: zero rank all vars 1 1 1 1 1 1 1 2 1 3
1. z: Formula
2. x1: Formula
3. x2: Formula

(x1)+(x2)+1 = 0 (v:Var. x1x2 = v)
By: GenConclOnAps
Generated subgoals:

None

About:
impliesequalintaddapplynatural_numberexists