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Metamath Proof Explorer

Theorem wlklnwwlklnupgr2

Description: A walk of length N as word corresponds to the sequence of vertices in a walk of length N in a pseudograph. This variant of wlklnwwlkln2 does not require G to be a simple pseudograph, but it requires (indirectly) the Axiom of Choice. (Contributed by Alexander van der Vekens, 21-Jul-2018) (Revised by AV, 12-Apr-2021)

		Ref	Expression
	Assertion	wlklnwwlklnupgr2	⊢ ( 𝐺 ∈ UPGraph → ( 𝑃 ∈ ( 𝑁 WWalksN 𝐺 ) → ∃ 𝑓 ( 𝑓 ( Walks ‘ 𝐺 ) 𝑃 ∧ ( ♯ ‘ 𝑓 ) = 𝑁 ) ) )

Proof

Step	Hyp	Ref	Expression
1		wlkiswwlksupgr2	⊢ ( 𝐺 ∈ UPGraph → ( 𝑃 ∈ ( WWalks ‘ 𝐺 ) → ∃ 𝑓 𝑓 ( Walks ‘ 𝐺 ) 𝑃 ) )
2	1	wlklnwwlkln2lem	⊢ ( 𝐺 ∈ UPGraph → ( 𝑃 ∈ ( 𝑁 WWalksN 𝐺 ) → ∃ 𝑓 ( 𝑓 ( Walks ‘ 𝐺 ) 𝑃 ∧ ( ♯ ‘ 𝑓 ) = 𝑁 ) ) )