Theorem reldmrelexp 15095

Description: The domain of the repeated composition of a relation is a relation. (Contributed by AV, 12-Jul-2024.)

Assertion

Ref	Expression
reldmrelexp	⊢ Rel dom ↑𝑟

Proof of Theorem reldmrelexp

Dummy variables 𝑛 𝑟 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-relexp 15094	. 2 ⊢ ↑𝑟 = (𝑟 ∈ V, 𝑛 ∈ ℕ0 ↦ if(𝑛 = 0, ( I ↾ (dom 𝑟 ∪ ran 𝑟)), (seq1((𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑥 ∘ 𝑟)), (𝑧 ∈ V ↦ 𝑟))‘𝑛)))
2	1	reldmmpo 7548	1 ⊢ Rel dom ↑𝑟

This proof depends on syntax axioms:   = wceq 1570  Vcvv 3450   ∪ cun 3897  ifcif 4482   ↦ cmpt 5186   I cid 5549  dom cdm 5655  ran crn 5656   ↾ cres 5657   ∘ ccom 5659  Rel wrel 5660  ‘cfv 6533   ∈ cmpo 7416  0cc0 11125  1c1 11126  ℕ₀cn0 12529  seqcseq 14066  ↑_𝑟crelexp 15093

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2732  ax-sep 5251  ax-pr 5398

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-rab 3413  df-v 3452  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-br 5104  df-opab 5168  df-xp 5661  df-rel 5662  df-dm 5665  df-oprab 7418  df-mpo 7419  df-relexp 15094

This theorem is used by:  relexpsucrd  15107  relexpsucld  15108  relexpreld  15114  relexpdmd  15118  relexprnd  15122  relexpfldd  15124  relexpaddd  15128  dfrtrclrec2  15132  relexpindlem  15137