Metamath Proof Explorer


Theorem eceq2i

Description: Equality theorem for the A -coset and B -coset of C , inference version. (Contributed by Peter Mazsa, 11-May-2021)

Ref Expression
Hypothesis eceq2i.1
|- A = B
Assertion eceq2i
|- [ C ] A = [ C ] B

Proof

Step Hyp Ref Expression
1 eceq2i.1
 |-  A = B
2 eceq2
 |-  ( A = B -> [ C ] A = [ C ] B )
3 1 2 ax-mp
 |-  [ C ] A = [ C ] B