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fix modus ponens #198

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Merged
fblanqui merged 1 commit into from
Apr 1, 2026
Merged

fix modus ponens #198

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6 changes: 3 additions & 3 deletions fusion.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -743,9 +743,9 @@ module Hol : Hol_kernel = struct

let MP (Sequent(asl1,c1,k1)) (Sequent(asl2,c2,k2)) =
match head_args c1 with
| Const("==>",_), [_;c] ->
new_theorem (term_union asl1 asl2) c (Pmp(k1,k2))
| _ -> failwith "MP"
| Const("==>",_), [l;r] when alphaorder l c2 = 0 ->
new_theorem (term_union asl1 asl2) r (Pmp(k1,k2))
| _ -> failwith "MP: theorems do not agree"
;;

let DISCH a (Sequent(asl,c,k)) =
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