Metamath Proof Explorer


Theorem xrnrel

Description: A range Cartesian product is a relation. This is Scott Fenton's txprel with a different symbol, see https://github.com/metamath/set.mm/issues/2469 . (Contributed by Scott Fenton, 31-Mar-2012)

Ref Expression
Assertion xrnrel Rel ( 𝐴𝐵 )

Proof

Step Hyp Ref Expression
1 xrnss3v ( 𝐴𝐵 ) ⊆ ( V × ( V × V ) )
2 xpss ( V × ( V × V ) ) ⊆ ( V × V )
3 1 2 sstri ( 𝐴𝐵 ) ⊆ ( V × V )
4 df-rel ( Rel ( 𝐴𝐵 ) ↔ ( 𝐴𝐵 ) ⊆ ( V × V ) )
5 3 4 mpbir Rel ( 𝐴𝐵 )