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At: connex iff trichot 1 2

1. T : Type
2. R : TTProp
3. a,b:T. Dec(R(a,b))
4. a,b:TR(a,b) & R(b,a R(a,b) & R(b,a R(b,a) & R(a,b)
5. x : T
6. y : T
  R(x,y R(y,x)


By: (InstHyp [x;y] 4) THEN ProveProp


Generated subgoals:

None

About:
decidablefunctionuniversepropandorall
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