(5steps total) PrintForm Definitions core StandardLIB Doc
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At: iff preserves decidability 1 1
1. A : Prop
2. B : Prop
3. A
4. A  B
  B  B
By: (DNth 1 0) THEN (BackThru 4)

Generated subgoals:

None

About:
propor
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(5steps total) PrintForm Definitions core StandardLIB Doc