vtxdgfisf - Metamath Proof Explorer

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Theorem vtxdgfisf 29410

Description: The vertex degree function on graphs of finite size is a function from vertices to nonnegative integers. (Contributed by Mario Carneiro, 12-Mar-2015.) (Revised by Alexander van der Vekens, 20-Dec-2017.) (Revised by AV, 11-Dec-2020.)

**Hypotheses**
Ref	Expression
vtxdgf.v	⊢ 𝑉 = (Vtx‘𝐺)
vtxdg0e.i	⊢ 𝐼 = (iEdg‘𝐺)
vtxdgfisnn0.a	⊢ 𝐴 = dom 𝐼

**Assertion**
Ref	Expression
vtxdgfisf	⊢ ((𝐺 ∈ 𝑊 ∧ 𝐴 ∈ Fin) → (VtxDeg‘𝐺):𝑉⟶ℕ₀)

Proof of Theorem vtxdgfisf Dummy variable 𝑢 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		vtxdgf.v	. . . . 5 ⊢ 𝑉 = (Vtx‘𝐺)
2	1	vtxdgf 29405	. . . 4 ⊢ (𝐺 ∈ 𝑊 → (VtxDeg‘𝐺):𝑉⟶ℕ₀^*)
3	2	adantr 479	. . 3 ⊢ ((𝐺 ∈ 𝑊 ∧ 𝐴 ∈ Fin) → (VtxDeg‘𝐺):𝑉⟶ℕ₀^*)
4	3	ffnd 6721	. 2 ⊢ ((𝐺 ∈ 𝑊 ∧ 𝐴 ∈ Fin) → (VtxDeg‘𝐺) Fn 𝑉)
5		vtxdg0e.i	. . . . 5 ⊢ 𝐼 = (iEdg‘𝐺)
6		vtxdgfisnn0.a	. . . . 5 ⊢ 𝐴 = dom 𝐼
7	1, 5, 6	vtxdgfisnn0 29409	. . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝑢 ∈ 𝑉) → ((VtxDeg‘𝐺)‘𝑢) ∈ ℕ₀)
8	7	adantll 712	. . 3 ⊢ (((𝐺 ∈ 𝑊 ∧ 𝐴 ∈ Fin) ∧ 𝑢 ∈ 𝑉) → ((VtxDeg‘𝐺)‘𝑢) ∈ ℕ₀)
9	8	ralrimiva 3136	. 2 ⊢ ((𝐺 ∈ 𝑊 ∧ 𝐴 ∈ Fin) → ∀𝑢 ∈ 𝑉 ((VtxDeg‘𝐺)‘𝑢) ∈ ℕ₀)
10		ffnfv 7125	. 2 ⊢ ((VtxDeg‘𝐺):𝑉⟶ℕ₀ ↔ ((VtxDeg‘𝐺) Fn 𝑉 ∧ ∀𝑢 ∈ 𝑉 ((VtxDeg‘𝐺)‘𝑢) ∈ ℕ₀))
11	4, 9, 10	sylanbrc 581	1 ⊢ ((𝐺 ∈ 𝑊 ∧ 𝐴 ∈ Fin) → (VtxDeg‘𝐺):𝑉⟶ℕ₀)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 394 = wceq 1534 ∈ wcel 2099 ∀wral 3051 dom cdm 5674 Fn wfn 6541 ⟶wf 6542 ‘cfv 6546 Fincfn 8966 ℕ₀cn0 12518 ℕ₀^*cxnn0 12590 Vtxcvtx 28929 iEdgciedg 28930 VtxDegcvtxdg 29399

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2697 ax-rep 5282 ax-sep 5296 ax-nul 5303 ax-pow 5361 ax-pr 5425 ax-un 7738 ax-cnex 11205 ax-resscn 11206 ax-1cn 11207 ax-icn 11208 ax-addcl 11209 ax-addrcl 11210 ax-mulcl 11211 ax-mulrcl 11212 ax-mulcom 11213 ax-addass 11214 ax-mulass 11215 ax-distr 11216 ax-i2m1 11217 ax-1ne0 11218 ax-1rid 11219 ax-rnegex 11220 ax-rrecex 11221 ax-cnre 11222 ax-pre-lttri 11223 ax-pre-lttrn 11224 ax-pre-ltadd 11225 ax-pre-mulgt0 11226

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2529 df-eu 2558 df-clab 2704 df-cleq 2718 df-clel 2803 df-nfc 2878 df-ne 2931 df-nel 3037 df-ral 3052 df-rex 3061 df-reu 3365 df-rab 3420 df-v 3464 df-sbc 3776 df-csb 3892 df-dif 3949 df-un 3951 df-in 3953 df-ss 3963 df-pss 3966 df-nul 4323 df-if 4524 df-pw 4599 df-sn 4624 df-pr 4626 df-op 4630 df-uni 4906 df-int 4947 df-iun 4995 df-br 5146 df-opab 5208 df-mpt 5229 df-tr 5263 df-id 5572 df-eprel 5578 df-po 5586 df-so 5587 df-fr 5629 df-we 5631 df-xp 5680 df-rel 5681 df-cnv 5682 df-co 5683 df-dm 5684 df-rn 5685 df-res 5686 df-ima 5687 df-pred 6304 df-ord 6371 df-on 6372 df-lim 6373 df-suc 6374 df-iota 6498 df-fun 6548 df-fn 6549 df-f 6550 df-f1 6551 df-fo 6552 df-f1o 6553 df-fv 6554 df-riota 7372 df-ov 7419 df-oprab 7420 df-mpo 7421 df-om 7869 df-2nd 7996 df-frecs 8288 df-wrecs 8319 df-recs 8393 df-rdg 8432 df-1o 8488 df-er 8726 df-en 8967 df-dom 8968 df-sdom 8969 df-fin 8970 df-card 9975 df-pnf 11291 df-mnf 11292 df-xr 11293 df-ltxr 11294 df-le 11295 df-sub 11487 df-neg 11488 df-nn 12259 df-n0 12519 df-xnn0 12591 df-z 12605 df-uz 12869 df-xadd 13141 df-hash 14343 df-vtxdg 29400

This theorem is referenced by: vtxdgfusgrf 29431 eupth2lem3lem1 30158 eupth2lem3lem2 30159

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