Theorem reldmrelexp 15034

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 15033	. 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 7530	1 ⊢ Rel dom ↑𝑟

Syntax hints:   = wceq 1560  Vcvv 3454   ∪ cun 3902  ifcif 4480   ↦ cmpt 5181   I cid 5541  dom cdm 5647  ran crn 5648   ↾ cres 5649   ∘ ccom 5651  Rel wrel 5652  ‘cfv 6521   ∈ cmpo 7398  0cc0 11073  1c1 11074  ℕ₀cn0 12481  seqcseq 14014  ↑_𝑟crelexp 15032

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1815  ax-4 1829  ax-5 1930  ax-6 1987  ax-7 2028  ax-8 2144  ax-9 2152  ax-10 2175  ax-11 2191  ax-12 2212  ax-ext 2734  ax-sep 5246  ax-pr 5390

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1100  df-tru 1563  df-fal 1573  df-ex 1800  df-nf 1804  df-sb 2091  df-mo 2566  df-eu 2596  df-clab 2741  df-cleq 2754  df-clel 2837  df-nfc 2911  df-rab 3415  df-v 3456  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4481  df-sn 4583  df-pr 4585  df-op 4589  df-br 5101  df-opab 5163  df-xp 5653  df-rel 5654  df-dm 5657  df-oprab 7400  df-mpo 7401  df-relexp 15033

This theorem is referenced by:  relexpsucrd  15046  relexpsucld  15047  relexpreld  15053  relexpdmd  15057  relexprnd  15061  relexpfldd  15063  relexpaddd  15067  dfrtrclrec2  15071  relexpindlem  15076