Theorem numclwwlk3lem2lem 30458

Description: Lemma for numclwwlk3lem2 30459: The set of closed vertices of a fixed length 𝑁 on a fixed vertex 𝑉 is the union of the set of closed walks of length 𝑁 at 𝑉 with the last but one vertex being 𝑉 and the set of closed walks of length 𝑁 at 𝑉 with the last but one vertex not being 𝑉. (Contributed by AV, 1-May-2022.)

Hypotheses

Ref	Expression
numclwwlk3lem2.c	⊢ 𝐶 = (𝑣 ∈ 𝑉, 𝑛 ∈ (ℤ≥‘2) ↦ {𝑤 ∈ (𝑣(ClWWalksNOn‘𝐺)𝑛) ∣ (𝑤‘(𝑛 − 2)) = 𝑣})
numclwwlk3lem2.h	⊢ 𝐻 = (𝑣 ∈ 𝑉, 𝑛 ∈ (ℤ≥‘2) ↦ {𝑤 ∈ (𝑣(ClWWalksNOn‘𝐺)𝑛) ∣ (𝑤‘(𝑛 − 2)) ≠ 𝑣})

Assertion

Ref	Expression
numclwwlk3lem2lem	⊢ ((𝑋 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘2)) → (𝑋(ClWWalksNOn‘𝐺)𝑁) = ((𝑋𝐻𝑁) ∪ (𝑋𝐶𝑁)))

Distinct variable groups:   𝑛,𝐺,𝑣,𝑤   𝑛,𝑁,𝑣,𝑤   𝑛,𝑉,𝑣   𝑛,𝑋,𝑣,𝑤

Allowed substitution hints:   𝐶(𝑤,𝑣,𝑛)   𝐻(𝑤,𝑣,𝑛)   𝑉(𝑤)

Proof of Theorem numclwwlk3lem2lem

Step	Hyp	Ref	Expression
1		numclwwlk3lem2.h	. . . 4 ⊢ 𝐻 = (𝑣 ∈ 𝑉, 𝑛 ∈ (ℤ≥‘2) ↦ {𝑤 ∈ (𝑣(ClWWalksNOn‘𝐺)𝑛) ∣ (𝑤‘(𝑛 − 2)) ≠ 𝑣})
2	1	numclwwlkovh0 30447	. . 3 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘2)) → (𝑋𝐻𝑁) = {𝑤 ∈ (𝑋(ClWWalksNOn‘𝐺)𝑁) ∣ (𝑤‘(𝑁 − 2)) ≠ 𝑋})
3		numclwwlk3lem2.c	. . . 4 ⊢ 𝐶 = (𝑣 ∈ 𝑉, 𝑛 ∈ (ℤ≥‘2) ↦ {𝑤 ∈ (𝑣(ClWWalksNOn‘𝐺)𝑛) ∣ (𝑤‘(𝑛 − 2)) = 𝑣})
4	3	2clwwlk 30422	. . 3 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘2)) → (𝑋𝐶𝑁) = {𝑤 ∈ (𝑋(ClWWalksNOn‘𝐺)𝑁) ∣ (𝑤‘(𝑁 − 2)) = 𝑋})
5	2, 4	uneq12d 4121	. 2 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘2)) → ((𝑋𝐻𝑁) ∪ (𝑋𝐶𝑁)) = ({𝑤 ∈ (𝑋(ClWWalksNOn‘𝐺)𝑁) ∣ (𝑤‘(𝑁 − 2)) ≠ 𝑋} ∪ {𝑤 ∈ (𝑋(ClWWalksNOn‘𝐺)𝑁) ∣ (𝑤‘(𝑁 − 2)) = 𝑋}))
6		unrab 4267	. . 3 ⊢ ({𝑤 ∈ (𝑋(ClWWalksNOn‘𝐺)𝑁) ∣ (𝑤‘(𝑁 − 2)) ≠ 𝑋} ∪ {𝑤 ∈ (𝑋(ClWWalksNOn‘𝐺)𝑁) ∣ (𝑤‘(𝑁 − 2)) = 𝑋}) = {𝑤 ∈ (𝑋(ClWWalksNOn‘𝐺)𝑁) ∣ ((𝑤‘(𝑁 − 2)) ≠ 𝑋 ∨ (𝑤‘(𝑁 − 2)) = 𝑋)}
7		exmidne 2942	. . . . . 6 ⊢ ((𝑤‘(𝑁 − 2)) = 𝑋 ∨ (𝑤‘(𝑁 − 2)) ≠ 𝑋)
8		orcom 870	. . . . . 6 ⊢ (((𝑤‘(𝑁 − 2)) ≠ 𝑋 ∨ (𝑤‘(𝑁 − 2)) = 𝑋) ↔ ((𝑤‘(𝑁 − 2)) = 𝑋 ∨ (𝑤‘(𝑁 − 2)) ≠ 𝑋))
9	7, 8	mpbir 231	. . . . 5 ⊢ ((𝑤‘(𝑁 − 2)) ≠ 𝑋 ∨ (𝑤‘(𝑁 − 2)) = 𝑋)
10	9	a1i 11	. . . 4 ⊢ (𝑤 ∈ (𝑋(ClWWalksNOn‘𝐺)𝑁) → ((𝑤‘(𝑁 − 2)) ≠ 𝑋 ∨ (𝑤‘(𝑁 − 2)) = 𝑋))
11	10	rabeqc 3411	. . 3 ⊢ {𝑤 ∈ (𝑋(ClWWalksNOn‘𝐺)𝑁) ∣ ((𝑤‘(𝑁 − 2)) ≠ 𝑋 ∨ (𝑤‘(𝑁 − 2)) = 𝑋)} = (𝑋(ClWWalksNOn‘𝐺)𝑁)
12	6, 11	eqtri 2759	. 2 ⊢ ({𝑤 ∈ (𝑋(ClWWalksNOn‘𝐺)𝑁) ∣ (𝑤‘(𝑁 − 2)) ≠ 𝑋} ∪ {𝑤 ∈ (𝑋(ClWWalksNOn‘𝐺)𝑁) ∣ (𝑤‘(𝑁 − 2)) = 𝑋}) = (𝑋(ClWWalksNOn‘𝐺)𝑁)
13	5, 12	eqtr2di 2788	1 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘2)) → (𝑋(ClWWalksNOn‘𝐺)𝑁) = ((𝑋𝐻𝑁) ∪ (𝑋𝐶𝑁)))

Syntax hints:   → wi 4   ∧ wa 395   ∨ wo 847   = wceq 1541   ∈ wcel 2113   ≠ wne 2932  {crab 3399   ∪ cun 3899  ‘cfv 6492  (class class class)co 7358   ∈ cmpo 7360   − cmin 11364  2c2 12200  ℤ_≥cuz 12751  ClWWalksNOncclwwlknon 30162

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-10 2146  ax-11 2162  ax-12 2184  ax-ext 2708  ax-sep 5241  ax-nul 5251  ax-pr 5377

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-ral 3052  df-rex 3061  df-rab 3400  df-v 3442  df-sbc 3741  df-dif 3904  df-un 3906  df-in 3908  df-ss 3918  df-nul 4286  df-if 4480  df-pw 4556  df-sn 4581  df-pr 4583  df-op 4587  df-uni 4864  df-br 5099  df-opab 5161  df-id 5519  df-xp 5630  df-rel 5631  df-cnv 5632  df-co 5633  df-dm 5634  df-iota 6448  df-fun 6494  df-fv 6500  df-ov 7361  df-oprab 7362  df-mpo 7363

This theorem is referenced by:  numclwwlk3lem2  30459