Metamath Proof Explorer


Theorem rtrclexlem

Description: Existence of relation implies existence of union with Cartesian product of domain and range. (Contributed by RP, 1-Nov-2020)

Ref Expression
Assertion rtrclexlem R V R dom R ran R × dom R ran R V

Proof

Step Hyp Ref Expression
1 dmexg R V dom R V
2 rnexg R V ran R V
3 unexg dom R V ran R V dom R ran R V
4 1 2 3 syl2anc R V dom R ran R V
5 sqxpexg dom R ran R V dom R ran R × dom R ran R V
6 4 5 syl R V dom R ran R × dom R ran R V
7 unexg R V dom R ran R × dom R ran R V R dom R ran R × dom R ran R V
8 6 7 mpdan R V R dom R ran R × dom R ran R V