Theorem relexp0 14376

Description: A relation composed zero times is the (restricted) identity. (Contributed by RP, 22-May-2020.)

Assertion

Ref	Expression
relexp0	⊢ ((𝑅 ∈ 𝑉 ∧ Rel 𝑅) → (𝑅↑𝑟0) = ( I ↾ ∪ ∪ 𝑅))

Proof of Theorem relexp0

Step	Hyp	Ref	Expression
1		relexp0g 14375	. 2 ⊢ (𝑅 ∈ 𝑉 → (𝑅↑𝑟0) = ( I ↾ (dom 𝑅 ∪ ran 𝑅)))
2		relfld 6121	. . . 4 ⊢ (Rel 𝑅 → ∪ ∪ 𝑅 = (dom 𝑅 ∪ ran 𝑅))
3	2	reseq2d 5848	. . 3 ⊢ (Rel 𝑅 → ( I ↾ ∪ ∪ 𝑅) = ( I ↾ (dom 𝑅 ∪ ran 𝑅)))
4	3	eqcomd 2827	. 2 ⊢ (Rel 𝑅 → ( I ↾ (dom 𝑅 ∪ ran 𝑅)) = ( I ↾ ∪ ∪ 𝑅))
5	1, 4	sylan9eq 2876	1 ⊢ ((𝑅 ∈ 𝑉 ∧ Rel 𝑅) → (𝑅↑𝑟0) = ( I ↾ ∪ ∪ 𝑅))

Syntax hints:   → wi 4   ∧ wa 398   = wceq 1533   ∈ wcel 2110   ∪ cun 3934  ∪ cuni 4832   I cid 5454  dom cdm 5550  ran crn 5551   ↾ cres 5552  Rel wrel 5555  (class class class)co 7150  0cc0 10531  ↑_𝑟crelexp 14373

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2156  ax-12 2172  ax-ext 2793  ax-sep 5196  ax-nul 5203  ax-pow 5259  ax-pr 5322  ax-un 7455  ax-1cn 10589  ax-icn 10590  ax-addcl 10591  ax-mulcl 10593  ax-i2m1 10599

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3497  df-sbc 3773  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4833  df-br 5060  df-opab 5122  df-id 5455  df-xp 5556  df-rel 5557  df-cnv 5558  df-co 5559  df-dm 5560  df-rn 5561  df-res 5562  df-iota 6309  df-fun 6352  df-fv 6358  df-ov 7153  df-oprab 7154  df-mpo 7155  df-n0 11892  df-relexp 14374

This theorem is referenced by:  relexp0d  14377  relexpsucr  14382  relexpsucl  14386  relexpindlem  14416