eqt<>pi

Theorem.

Arguments:

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

Hypotheses:

(ceqd)
(aeqb)

Assertions:

((altc)leftrightarrow(bltd))

Proof:

Hyp Ref Line Expr
Hypo1(ceqd)
2(aeqb)
2eqt<p3((altd)leftrightarrow(bltd))
1eqt>p4((altc)leftrightarrow(altd))
3, 4bitr5((altc)leftrightarrow(bltd))