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Mathbox for Alexander van der Vekens |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > 1hegrlfgr | Structured version Visualization version GIF version |
Description: A graph 𝐺 with one hyperedge joining at least two vertices is a loop-free graph. (Contributed by AV, 23-Feb-2021.) |
Ref | Expression |
---|---|
1hegrlfgr.a | ⊢ (𝜑 → 𝐴 ∈ 𝑋) |
1hegrlfgr.b | ⊢ (𝜑 → 𝐵 ∈ 𝑉) |
1hegrlfgr.c | ⊢ (𝜑 → 𝐶 ∈ 𝑉) |
1hegrlfgr.n | ⊢ (𝜑 → 𝐵 ≠ 𝐶) |
1hegrlfgr.x | ⊢ (𝜑 → 𝐸 ∈ 𝒫 𝑉) |
1hegrlfgr.i | ⊢ (𝜑 → (iEdg‘𝐺) = {⟨𝐴, 𝐸⟩}) |
1hegrlfgr.e | ⊢ (𝜑 → {𝐵, 𝐶} ⊆ 𝐸) |
Ref | Expression |
---|---|
1hegrlfgr | ⊢ (𝜑 → (iEdg‘𝐺):{𝐴}⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (♯‘𝑥)}) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1hegrlfgr.a | . . . . 5 ⊢ (𝜑 → 𝐴 ∈ 𝑋) | |
2 | 1hegrlfgr.x | . . . . 5 ⊢ (𝜑 → 𝐸 ∈ 𝒫 𝑉) | |
3 | f1osng 6875 | . . . . 5 ⊢ ((𝐴 ∈ 𝑋 ∧ 𝐸 ∈ 𝒫 𝑉) → {⟨𝐴, 𝐸⟩}:{𝐴}–1-1-onto→{𝐸}) | |
4 | 1, 2, 3 | syl2anc 582 | . . . 4 ⊢ (𝜑 → {⟨𝐴, 𝐸⟩}:{𝐴}–1-1-onto→{𝐸}) |
5 | f1of 6834 | . . . 4 ⊢ ({⟨𝐴, 𝐸⟩}:{𝐴}–1-1-onto→{𝐸} → {⟨𝐴, 𝐸⟩}:{𝐴}⟶{𝐸}) | |
6 | 4, 5 | syl 17 | . . 3 ⊢ (𝜑 → {⟨𝐴, 𝐸⟩}:{𝐴}⟶{𝐸}) |
7 | 1hegrlfgr.e | . . . . . . 7 ⊢ (𝜑 → {𝐵, 𝐶} ⊆ 𝐸) | |
8 | 1hegrlfgr.b | . . . . . . . 8 ⊢ (𝜑 → 𝐵 ∈ 𝑉) | |
9 | prid1g 4760 | . . . . . . . 8 ⊢ (𝐵 ∈ 𝑉 → 𝐵 ∈ {𝐵, 𝐶}) | |
10 | 8, 9 | syl 17 | . . . . . . 7 ⊢ (𝜑 → 𝐵 ∈ {𝐵, 𝐶}) |
11 | 7, 10 | sseldd 3973 | . . . . . 6 ⊢ (𝜑 → 𝐵 ∈ 𝐸) |
12 | 1hegrlfgr.c | . . . . . . . 8 ⊢ (𝜑 → 𝐶 ∈ 𝑉) | |
13 | prid2g 4761 | . . . . . . . 8 ⊢ (𝐶 ∈ 𝑉 → 𝐶 ∈ {𝐵, 𝐶}) | |
14 | 12, 13 | syl 17 | . . . . . . 7 ⊢ (𝜑 → 𝐶 ∈ {𝐵, 𝐶}) |
15 | 7, 14 | sseldd 3973 | . . . . . 6 ⊢ (𝜑 → 𝐶 ∈ 𝐸) |
16 | 1hegrlfgr.n | . . . . . 6 ⊢ (𝜑 → 𝐵 ≠ 𝐶) | |
17 | 2, 11, 15, 16 | nehash2 14467 | . . . . 5 ⊢ (𝜑 → 2 ≤ (♯‘𝐸)) |
18 | fveq2 6892 | . . . . . . 7 ⊢ (𝑥 = 𝐸 → (♯‘𝑥) = (♯‘𝐸)) | |
19 | 18 | breq2d 5155 | . . . . . 6 ⊢ (𝑥 = 𝐸 → (2 ≤ (♯‘𝑥) ↔ 2 ≤ (♯‘𝐸))) |
20 | 19 | elrab 3674 | . . . . 5 ⊢ (𝐸 ∈ {𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (♯‘𝑥)} ↔ (𝐸 ∈ 𝒫 𝑉 ∧ 2 ≤ (♯‘𝐸))) |
21 | 2, 17, 20 | sylanbrc 581 | . . . 4 ⊢ (𝜑 → 𝐸 ∈ {𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (♯‘𝑥)}) |
22 | 21 | snssd 4808 | . . 3 ⊢ (𝜑 → {𝐸} ⊆ {𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (♯‘𝑥)}) |
23 | 6, 22 | fssd 6735 | . 2 ⊢ (𝜑 → {⟨𝐴, 𝐸⟩}:{𝐴}⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (♯‘𝑥)}) |
24 | 1hegrlfgr.i | . . 3 ⊢ (𝜑 → (iEdg‘𝐺) = {⟨𝐴, 𝐸⟩}) | |
25 | 24 | feq1d 6702 | . 2 ⊢ (𝜑 → ((iEdg‘𝐺):{𝐴}⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (♯‘𝑥)} ↔ {⟨𝐴, 𝐸⟩}:{𝐴}⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (♯‘𝑥)})) |
26 | 23, 25 | mpbird 256 | 1 ⊢ (𝜑 → (iEdg‘𝐺):{𝐴}⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (♯‘𝑥)}) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1533 ∈ wcel 2098 ≠ wne 2930 {crab 3419 ⊆ wss 3939 𝒫 cpw 4598 {csn 4624 {cpr 4626 ⟨cop 4630 class class class wbr 5143 ⟶wf 6539 –1-1-onto→wf1o 6542 ‘cfv 6543 ≤ cle 11279 2c2 12297 ♯chash 14321 iEdgciedg 28854 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2696 ax-sep 5294 ax-nul 5301 ax-pow 5359 ax-pr 5423 ax-un 7738 ax-cnex 11194 ax-resscn 11195 ax-1cn 11196 ax-icn 11197 ax-addcl 11198 ax-addrcl 11199 ax-mulcl 11200 ax-mulrcl 11201 ax-mulcom 11202 ax-addass 11203 ax-mulass 11204 ax-distr 11205 ax-i2m1 11206 ax-1ne0 11207 ax-1rid 11208 ax-rnegex 11209 ax-rrecex 11210 ax-cnre 11211 ax-pre-lttri 11212 ax-pre-lttrn 11213 ax-pre-ltadd 11214 ax-pre-mulgt0 11215 |
This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2703 df-cleq 2717 df-clel 2802 df-nfc 2877 df-ne 2931 df-nel 3037 df-ral 3052 df-rex 3061 df-reu 3365 df-rab 3420 df-v 3465 df-sbc 3769 df-csb 3885 df-dif 3942 df-un 3944 df-in 3946 df-ss 3956 df-pss 3959 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-int 4945 df-iun 4993 df-br 5144 df-opab 5206 df-mpt 5227 df-tr 5261 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7372 df-ov 7419 df-oprab 7420 df-mpo 7421 df-om 7869 df-1st 7991 df-2nd 7992 df-frecs 8285 df-wrecs 8316 df-recs 8390 df-rdg 8429 df-1o 8485 df-oadd 8489 df-er 8723 df-en 8963 df-dom 8964 df-sdom 8965 df-fin 8966 df-dju 9924 df-card 9962 df-pnf 11280 df-mnf 11281 df-xr 11282 df-ltxr 11283 df-le 11284 df-sub 11476 df-neg 11477 df-nn 12243 df-2 12305 df-n0 12503 df-xnn0 12575 df-z 12589 df-uz 12853 df-fz 13517 df-hash 14322 |
This theorem is referenced by: (None) |
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