| Some definitions of interest. |
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iff | Def P ![](FONT/if_big.png) Q == (P ![](FONT/eq.png) Q) & (P ![](FONT/if_big.png) Q) |
| | Thm* A,B:Prop. (A ![](FONT/if_big.png) B) Prop |
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is_finite_type | Def Finite(A) == n: . A ~ n |
| | Thm* A:Type. Finite(A) Prop |
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unboundedly_infinite | Def Unbounded(A) == k: . ![](FONT/exi.png) ( k inj A) |
| | Thm* A:Type. Unbounded(A) Prop |
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not | Def A == A ![](FONT/eq.png) False |
| | Thm* A:Prop. ( A) Prop |
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rev_implies | Def P ![](FONT/if_big.png) Q == Q ![](FONT/eq.png) P |
| | Thm* A,B:Prop. (A ![](FONT/if_big.png) B) Prop |