(4steps total) PrintForm Definitions Lemmas num thy 1 Sections StandardLIB Search Doc
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At: assoced nelim 1
1. a : 
2. b : 
  a = b  a = -b  a = b
By: GenRepD

Generated subgoals:

1 3. a = b  a = -b
  a = b
1 step
2 3. a = b
  a = b  a = -b
1 step

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(4steps total) PrintForm Definitions Lemmas num thy 1 Sections StandardLIB Search Doc