<2trd

Theorem.

Arguments:

a (obj), b (obj), c (obj), d (obj), phi (pr),

Hypotheses:

(phito(deqb))
(phito(ceqa))
(phito(aleb))

Assertions:

(phito(cled))

Proof:

Hyp Ref Line Expr
Hypo1(phito(deqb))
2(phito(ceqa))
3(phito(aleb))
2eqsym4(phito(aeqc))
1eqsym5(phito(beqd))
3, 4, 5>2trd6(phito(cled))