Theorem reldmrelexp 14584

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 14583	. 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 7344	1 ⊢ Rel dom ↑𝑟

Syntax hints:   = wceq 1543  Vcvv 3408   ∪ cun 3864  ifcif 4439   ↦ cmpt 5135   I cid 5454  dom cdm 5551  ran crn 5552   ↾ cres 5553   ∘ ccom 5555  Rel wrel 5556  ‘cfv 6380   ∈ cmpo 7215  0cc0 10729  1c1 10730  ℕ₀cn0 12090  seqcseq 13574  ↑_𝑟crelexp 14582

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1976  ax-7 2016  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2158  ax-12 2175  ax-ext 2708  ax-sep 5192  ax-nul 5199  ax-pr 5322

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 848  df-3an 1091  df-tru 1546  df-fal 1556  df-ex 1788  df-nf 1792  df-sb 2071  df-mo 2539  df-eu 2568  df-clab 2715  df-cleq 2729  df-clel 2816  df-nfc 2886  df-rab 3070  df-v 3410  df-dif 3869  df-un 3871  df-in 3873  df-ss 3883  df-nul 4238  df-if 4440  df-sn 4542  df-pr 4544  df-op 4548  df-br 5054  df-opab 5116  df-xp 5557  df-rel 5558  df-dm 5561  df-oprab 7217  df-mpo 7218  df-relexp 14583

This theorem is referenced by:  relexpsucrd  14596  relexpsucld  14597  relexpreld  14603  relexpdmd  14607  relexprnd  14611  relexpfldd  14613  relexpaddd  14617  dfrtrclrec2  14621  relexpindlem  14626