Metamath Proof Explorer


Theorem sqcld

Description: Closure of square. (Contributed by Mario Carneiro, 28-May-2016)

Ref Expression
Hypothesis expcld.1 φA
Assertion sqcld φA2

Proof

Step Hyp Ref Expression
1 expcld.1 φA
2 sqcl AA2
3 1 2 syl φA2