Step |
Hyp |
Ref |
Expression |
1 |
|
coeq2 |
|- ( A = B -> ( `' ( 1st |` ( _V X. _V ) ) o. A ) = ( `' ( 1st |` ( _V X. _V ) ) o. B ) ) |
2 |
1
|
ineq1d |
|- ( A = B -> ( ( `' ( 1st |` ( _V X. _V ) ) o. A ) i^i ( `' ( 2nd |` ( _V X. _V ) ) o. C ) ) = ( ( `' ( 1st |` ( _V X. _V ) ) o. B ) i^i ( `' ( 2nd |` ( _V X. _V ) ) o. C ) ) ) |
3 |
|
df-xrn |
|- ( A |X. C ) = ( ( `' ( 1st |` ( _V X. _V ) ) o. A ) i^i ( `' ( 2nd |` ( _V X. _V ) ) o. C ) ) |
4 |
|
df-xrn |
|- ( B |X. C ) = ( ( `' ( 1st |` ( _V X. _V ) ) o. B ) i^i ( `' ( 2nd |` ( _V X. _V ) ) o. C ) ) |
5 |
2 3 4
|
3eqtr4g |
|- ( A = B -> ( A |X. C ) = ( B |X. C ) ) |