Theorem reldmrelexp 14974

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 14973	. 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 7490	1 ⊢ Rel dom ↑𝑟

Syntax hints:   = wceq 1547  Vcvv 3431   ∪ cun 3881  ifcif 4454   ↦ cmpt 5153   I cid 5512  dom cdm 5618  ran crn 5619   ↾ cres 5620   ∘ ccom 5622  Rel wrel 5623  ‘cfv 6485   ∈ cmpo 7358  0cc0 11029  1c1 11030  ℕ₀cn0 12428  seqcseq 13954  ↑_𝑟crelexp 14972

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-10 2152  ax-11 2168  ax-12 2189  ax-ext 2711  ax-sep 5218  ax-pr 5362

This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-nf 1791  df-sb 2074  df-mo 2543  df-eu 2573  df-clab 2718  df-cleq 2731  df-clel 2814  df-nfc 2888  df-rab 3392  df-v 3433  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4262  df-if 4455  df-sn 4556  df-pr 4558  df-op 4562  df-br 5073  df-opab 5135  df-xp 5624  df-rel 5625  df-dm 5628  df-oprab 7360  df-mpo 7361  df-relexp 14973

This theorem is referenced by:  relexpsucrd  14986  relexpsucld  14987  relexpreld  14993  relexpdmd  14997  relexprnd  15001  relexpfldd  15003  relexpaddd  15007  dfrtrclrec2  15011  relexpindlem  15016