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Theorem relcoi1 5214
Description: Composition with the identity relation restricted to a relation's field. (Contributed by FL, 8-May-2011.)
Assertion
Ref Expression
relcoi1 (Rel 𝑅 → (𝑅 ∘ ( I ↾ 𝑅)) = 𝑅)

Proof of Theorem relcoi1
StepHypRef Expression
1 relfld 5211 . . 3 (Rel 𝑅 𝑅 = (dom 𝑅 ∪ ran 𝑅))
2 resundi 4972 . . . . 5 ( I ↾ (dom 𝑅 ∪ ran 𝑅)) = (( I ↾ dom 𝑅) ∪ ( I ↾ ran 𝑅))
3 coeq2 4836 . . . . 5 (( I ↾ (dom 𝑅 ∪ ran 𝑅)) = (( I ↾ dom 𝑅) ∪ ( I ↾ ran 𝑅)) → (𝑅 ∘ ( I ↾ (dom 𝑅 ∪ ran 𝑅))) = (𝑅 ∘ (( I ↾ dom 𝑅) ∪ ( I ↾ ran 𝑅))))
4 coundi 5184 . . . . . . 7 (𝑅 ∘ (( I ↾ dom 𝑅) ∪ ( I ↾ ran 𝑅))) = ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅)))
5 resco 5187 . . . . . . . 8 ((𝑅 ∘ I ) ↾ dom 𝑅) = (𝑅 ∘ ( I ↾ dom 𝑅))
6 coi1 5198 . . . . . . . . 9 (Rel 𝑅 → (𝑅 ∘ I ) = 𝑅)
7 reseq1 4953 . . . . . . . . . 10 ((𝑅 ∘ I ) = 𝑅 → ((𝑅 ∘ I ) ↾ dom 𝑅) = (𝑅 ↾ dom 𝑅))
8 resdm 4998 . . . . . . . . . . 11 (Rel 𝑅 → (𝑅 ↾ dom 𝑅) = 𝑅)
9 eqtr 2223 . . . . . . . . . . . . . 14 ((((𝑅 ∘ I ) ↾ dom 𝑅) = (𝑅 ↾ dom 𝑅) ∧ (𝑅 ↾ dom 𝑅) = 𝑅) → ((𝑅 ∘ I ) ↾ dom 𝑅) = 𝑅)
10 eqtr 2223 . . . . . . . . . . . . . . . . . 18 (((𝑅 ∘ ( I ↾ dom 𝑅)) = ((𝑅 ∘ I ) ↾ dom 𝑅) ∧ ((𝑅 ∘ I ) ↾ dom 𝑅) = 𝑅) → (𝑅 ∘ ( I ↾ dom 𝑅)) = 𝑅)
11 resco 5187 . . . . . . . . . . . . . . . . . . 19 ((𝑅 ∘ I ) ↾ ran 𝑅) = (𝑅 ∘ ( I ↾ ran 𝑅))
12 uneq1 3320 . . . . . . . . . . . . . . . . . . 19 ((𝑅 ∘ ( I ↾ dom 𝑅)) = 𝑅 → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ∘ ( I ↾ ran 𝑅))))
13 reseq1 4953 . . . . . . . . . . . . . . . . . . . . . 22 ((𝑅 ∘ I ) = 𝑅 → ((𝑅 ∘ I ) ↾ ran 𝑅) = (𝑅 ↾ ran 𝑅))
14 eqtr 2223 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 (((𝑅 ∘ ( I ↾ ran 𝑅)) = ((𝑅 ∘ I ) ↾ ran 𝑅) ∧ ((𝑅 ∘ I ) ↾ ran 𝑅) = (𝑅 ↾ ran 𝑅)) → (𝑅 ∘ ( I ↾ ran 𝑅)) = (𝑅 ↾ ran 𝑅))
1514uneq2d 3327 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (((𝑅 ∘ ( I ↾ ran 𝑅)) = ((𝑅 ∘ I ) ↾ ran 𝑅) ∧ ((𝑅 ∘ I ) ↾ ran 𝑅) = (𝑅 ↾ ran 𝑅)) → (𝑅 ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ↾ ran 𝑅)))
16 eqtr 2223 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ((((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) ∧ (𝑅 ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ↾ ran 𝑅))) → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ↾ ran 𝑅)))
17 resss 4983 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 (𝑅 ↾ ran 𝑅) ⊆ 𝑅
18 ssequn2 3346 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 ((𝑅 ↾ ran 𝑅) ⊆ 𝑅 ↔ (𝑅 ∪ (𝑅 ↾ ran 𝑅)) = 𝑅)
1917, 18mpbi 145 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 (𝑅 ∪ (𝑅 ↾ ran 𝑅)) = 𝑅
2019, 6eqtr4id 2257 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 (Rel 𝑅 → (𝑅 ∪ (𝑅 ↾ ran 𝑅)) = (𝑅 ∘ I ))
21 eqeq1 2212 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 (((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ↾ ran 𝑅)) → (((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I ) ↔ (𝑅 ∪ (𝑅 ↾ ran 𝑅)) = (𝑅 ∘ I )))
2220, 21imbitrrid 156 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ↾ ran 𝑅)) → (Rel 𝑅 → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I )))
2316, 22syl 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ((((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) ∧ (𝑅 ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ↾ ran 𝑅))) → (Rel 𝑅 → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I )))
2423ex 115 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 (((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) → ((𝑅 ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ↾ ran 𝑅)) → (Rel 𝑅 → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I ))))
2524com3l 81 . . . . . . . . . . . . . . . . . . . . . . . . . 26 ((𝑅 ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ↾ ran 𝑅)) → (Rel 𝑅 → (((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I ))))
2615, 25syl 14 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((𝑅 ∘ ( I ↾ ran 𝑅)) = ((𝑅 ∘ I ) ↾ ran 𝑅) ∧ ((𝑅 ∘ I ) ↾ ran 𝑅) = (𝑅 ↾ ran 𝑅)) → (Rel 𝑅 → (((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I ))))
2726ex 115 . . . . . . . . . . . . . . . . . . . . . . . 24 ((𝑅 ∘ ( I ↾ ran 𝑅)) = ((𝑅 ∘ I ) ↾ ran 𝑅) → (((𝑅 ∘ I ) ↾ ran 𝑅) = (𝑅 ↾ ran 𝑅) → (Rel 𝑅 → (((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I )))))
2827eqcoms 2208 . . . . . . . . . . . . . . . . . . . . . . 23 (((𝑅 ∘ I ) ↾ ran 𝑅) = (𝑅 ∘ ( I ↾ ran 𝑅)) → (((𝑅 ∘ I ) ↾ ran 𝑅) = (𝑅 ↾ ran 𝑅) → (Rel 𝑅 → (((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I )))))
2928com3l 81 . . . . . . . . . . . . . . . . . . . . . 22 (((𝑅 ∘ I ) ↾ ran 𝑅) = (𝑅 ↾ ran 𝑅) → (Rel 𝑅 → (((𝑅 ∘ I ) ↾ ran 𝑅) = (𝑅 ∘ ( I ↾ ran 𝑅)) → (((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I )))))
3013, 29syl 14 . . . . . . . . . . . . . . . . . . . . 21 ((𝑅 ∘ I ) = 𝑅 → (Rel 𝑅 → (((𝑅 ∘ I ) ↾ ran 𝑅) = (𝑅 ∘ ( I ↾ ran 𝑅)) → (((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I )))))
316, 30mpcom 36 . . . . . . . . . . . . . . . . . . . 20 (Rel 𝑅 → (((𝑅 ∘ I ) ↾ ran 𝑅) = (𝑅 ∘ ( I ↾ ran 𝑅)) → (((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I ))))
3231com3l 81 . . . . . . . . . . . . . . . . . . 19 (((𝑅 ∘ I ) ↾ ran 𝑅) = (𝑅 ∘ ( I ↾ ran 𝑅)) → (((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) → (Rel 𝑅 → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I ))))
3311, 12, 32mpsyl 65 . . . . . . . . . . . . . . . . . 18 ((𝑅 ∘ ( I ↾ dom 𝑅)) = 𝑅 → (Rel 𝑅 → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I )))
3410, 33syl 14 . . . . . . . . . . . . . . . . 17 (((𝑅 ∘ ( I ↾ dom 𝑅)) = ((𝑅 ∘ I ) ↾ dom 𝑅) ∧ ((𝑅 ∘ I ) ↾ dom 𝑅) = 𝑅) → (Rel 𝑅 → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I )))
3534ex 115 . . . . . . . . . . . . . . . 16 ((𝑅 ∘ ( I ↾ dom 𝑅)) = ((𝑅 ∘ I ) ↾ dom 𝑅) → (((𝑅 ∘ I ) ↾ dom 𝑅) = 𝑅 → (Rel 𝑅 → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I ))))
3635eqcoms 2208 . . . . . . . . . . . . . . 15 (((𝑅 ∘ I ) ↾ dom 𝑅) = (𝑅 ∘ ( I ↾ dom 𝑅)) → (((𝑅 ∘ I ) ↾ dom 𝑅) = 𝑅 → (Rel 𝑅 → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I ))))
3736com3l 81 . . . . . . . . . . . . . 14 (((𝑅 ∘ I ) ↾ dom 𝑅) = 𝑅 → (Rel 𝑅 → (((𝑅 ∘ I ) ↾ dom 𝑅) = (𝑅 ∘ ( I ↾ dom 𝑅)) → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I ))))
389, 37syl 14 . . . . . . . . . . . . 13 ((((𝑅 ∘ I ) ↾ dom 𝑅) = (𝑅 ↾ dom 𝑅) ∧ (𝑅 ↾ dom 𝑅) = 𝑅) → (Rel 𝑅 → (((𝑅 ∘ I ) ↾ dom 𝑅) = (𝑅 ∘ ( I ↾ dom 𝑅)) → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I ))))
3938ex 115 . . . . . . . . . . . 12 (((𝑅 ∘ I ) ↾ dom 𝑅) = (𝑅 ↾ dom 𝑅) → ((𝑅 ↾ dom 𝑅) = 𝑅 → (Rel 𝑅 → (((𝑅 ∘ I ) ↾ dom 𝑅) = (𝑅 ∘ ( I ↾ dom 𝑅)) → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I )))))
4039com3l 81 . . . . . . . . . . 11 ((𝑅 ↾ dom 𝑅) = 𝑅 → (Rel 𝑅 → (((𝑅 ∘ I ) ↾ dom 𝑅) = (𝑅 ↾ dom 𝑅) → (((𝑅 ∘ I ) ↾ dom 𝑅) = (𝑅 ∘ ( I ↾ dom 𝑅)) → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I )))))
418, 40mpcom 36 . . . . . . . . . 10 (Rel 𝑅 → (((𝑅 ∘ I ) ↾ dom 𝑅) = (𝑅 ↾ dom 𝑅) → (((𝑅 ∘ I ) ↾ dom 𝑅) = (𝑅 ∘ ( I ↾ dom 𝑅)) → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I ))))
427, 41syl5com 29 . . . . . . . . 9 ((𝑅 ∘ I ) = 𝑅 → (Rel 𝑅 → (((𝑅 ∘ I ) ↾ dom 𝑅) = (𝑅 ∘ ( I ↾ dom 𝑅)) → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I ))))
436, 42mpcom 36 . . . . . . . 8 (Rel 𝑅 → (((𝑅 ∘ I ) ↾ dom 𝑅) = (𝑅 ∘ ( I ↾ dom 𝑅)) → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I )))
445, 43mpi 15 . . . . . . 7 (Rel 𝑅 → ((𝑅 ∘ ( I ↾ dom 𝑅)) ∪ (𝑅 ∘ ( I ↾ ran 𝑅))) = (𝑅 ∘ I ))
454, 44eqtrid 2250 . . . . . 6 (Rel 𝑅 → (𝑅 ∘ (( I ↾ dom 𝑅) ∪ ( I ↾ ran 𝑅))) = (𝑅 ∘ I ))
46 eqeq1 2212 . . . . . 6 ((𝑅 ∘ ( I ↾ (dom 𝑅 ∪ ran 𝑅))) = (𝑅 ∘ (( I ↾ dom 𝑅) ∪ ( I ↾ ran 𝑅))) → ((𝑅 ∘ ( I ↾ (dom 𝑅 ∪ ran 𝑅))) = (𝑅 ∘ I ) ↔ (𝑅 ∘ (( I ↾ dom 𝑅) ∪ ( I ↾ ran 𝑅))) = (𝑅 ∘ I )))
4745, 46imbitrrid 156 . . . . 5 ((𝑅 ∘ ( I ↾ (dom 𝑅 ∪ ran 𝑅))) = (𝑅 ∘ (( I ↾ dom 𝑅) ∪ ( I ↾ ran 𝑅))) → (Rel 𝑅 → (𝑅 ∘ ( I ↾ (dom 𝑅 ∪ ran 𝑅))) = (𝑅 ∘ I )))
482, 3, 47mp2b 8 . . . 4 (Rel 𝑅 → (𝑅 ∘ ( I ↾ (dom 𝑅 ∪ ran 𝑅))) = (𝑅 ∘ I ))
49 reseq2 4954 . . . . . 6 ( 𝑅 = (dom 𝑅 ∪ ran 𝑅) → ( I ↾ 𝑅) = ( I ↾ (dom 𝑅 ∪ ran 𝑅)))
5049coeq2d 4840 . . . . 5 ( 𝑅 = (dom 𝑅 ∪ ran 𝑅) → (𝑅 ∘ ( I ↾ 𝑅)) = (𝑅 ∘ ( I ↾ (dom 𝑅 ∪ ran 𝑅))))
5150eqeq1d 2214 . . . 4 ( 𝑅 = (dom 𝑅 ∪ ran 𝑅) → ((𝑅 ∘ ( I ↾ 𝑅)) = (𝑅 ∘ I ) ↔ (𝑅 ∘ ( I ↾ (dom 𝑅 ∪ ran 𝑅))) = (𝑅 ∘ I )))
5248, 51imbitrrid 156 . . 3 ( 𝑅 = (dom 𝑅 ∪ ran 𝑅) → (Rel 𝑅 → (𝑅 ∘ ( I ↾ 𝑅)) = (𝑅 ∘ I )))
531, 52mpcom 36 . 2 (Rel 𝑅 → (𝑅 ∘ ( I ↾ 𝑅)) = (𝑅 ∘ I ))
5453, 6eqtrd 2238 1 (Rel 𝑅 → (𝑅 ∘ ( I ↾ 𝑅)) = 𝑅)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104   = wceq 1373  cun 3164  wss 3166   cuni 3850   I cid 4335  dom cdm 4675  ran crn 4676  cres 4677  ccom 4679  Rel wrel 4680
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 711  ax-5 1470  ax-7 1471  ax-gen 1472  ax-ie1 1516  ax-ie2 1517  ax-8 1527  ax-10 1528  ax-11 1529  ax-i12 1530  ax-bndl 1532  ax-4 1533  ax-17 1549  ax-i9 1553  ax-ial 1557  ax-i5r 1558  ax-14 2179  ax-ext 2187  ax-sep 4162  ax-pow 4218  ax-pr 4253
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1484  df-sb 1786  df-eu 2057  df-mo 2058  df-clab 2192  df-cleq 2198  df-clel 2201  df-nfc 2337  df-ral 2489  df-rex 2490  df-v 2774  df-un 3170  df-in 3172  df-ss 3179  df-pw 3618  df-sn 3639  df-pr 3640  df-op 3642  df-uni 3851  df-br 4045  df-opab 4106  df-id 4340  df-xp 4681  df-rel 4682  df-cnv 4683  df-co 4684  df-dm 4685  df-rn 4686  df-res 4687
This theorem is referenced by: (None)
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