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Theorem symgfvne 19328

Description: The function values of a permutation for different arguments are different. (Contributed by AV, 8-Jan-2019.)

**Hypotheses**
Ref	Expression
symgbas.1	⊢ 𝐺 = (SymGrp‘𝐴)
symgbas.2	⊢ 𝐵 = (Base‘𝐺)

**Assertion**
Ref	Expression
symgfvne	⊢ ((𝐹 ∈ 𝐵 ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → ((𝐹‘𝑋) = 𝑍 → (𝑌 ≠ 𝑋 → (𝐹‘𝑌) ≠ 𝑍)))

**Proof of Theorem symgfvne**
Step	Hyp	Ref	Expression
1		symgbas.1	. . . 4 ⊢ 𝐺 = (SymGrp‘𝐴)
2		symgbas.2	. . . 4 ⊢ 𝐵 = (Base‘𝐺)
3	1, 2	symgbasf1o 19322	. . 3 ⊢ (𝐹 ∈ 𝐵 → 𝐹:𝐴–1-1-onto→𝐴)
4		f1of1 6832	. . 3 ⊢ (𝐹:𝐴–1-1-onto→𝐴 → 𝐹:𝐴–1-1→𝐴)
5		eqeq2 2740	. . . . . . . 8 ⊢ (𝑍 = (𝐹‘𝑋) → ((𝐹‘𝑌) = 𝑍 ↔ (𝐹‘𝑌) = (𝐹‘𝑋)))
6	5	eqcoms 2736	. . . . . . 7 ⊢ ((𝐹‘𝑋) = 𝑍 → ((𝐹‘𝑌) = 𝑍 ↔ (𝐹‘𝑌) = (𝐹‘𝑋)))
7	6	adantl 481	. . . . . 6 ⊢ (((𝐹:𝐴–1-1→𝐴 ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) ∧ (𝐹‘𝑋) = 𝑍) → ((𝐹‘𝑌) = 𝑍 ↔ (𝐹‘𝑌) = (𝐹‘𝑋)))
8		simp1 1134	. . . . . . . 8 ⊢ ((𝐹:𝐴–1-1→𝐴 ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → 𝐹:𝐴–1-1→𝐴)
9		simp3 1136	. . . . . . . 8 ⊢ ((𝐹:𝐴–1-1→𝐴 ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → 𝑌 ∈ 𝐴)
10		simp2 1135	. . . . . . . 8 ⊢ ((𝐹:𝐴–1-1→𝐴 ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → 𝑋 ∈ 𝐴)
11		f1veqaeq 7261	. . . . . . . 8 ⊢ ((𝐹:𝐴–1-1→𝐴 ∧ (𝑌 ∈ 𝐴 ∧ 𝑋 ∈ 𝐴)) → ((𝐹‘𝑌) = (𝐹‘𝑋) → 𝑌 = 𝑋))
12	8, 9, 10, 11	syl12anc 836	. . . . . . 7 ⊢ ((𝐹:𝐴–1-1→𝐴 ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → ((𝐹‘𝑌) = (𝐹‘𝑋) → 𝑌 = 𝑋))
13	12	adantr 480	. . . . . 6 ⊢ (((𝐹:𝐴–1-1→𝐴 ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) ∧ (𝐹‘𝑋) = 𝑍) → ((𝐹‘𝑌) = (𝐹‘𝑋) → 𝑌 = 𝑋))
14	7, 13	sylbid 239	. . . . 5 ⊢ (((𝐹:𝐴–1-1→𝐴 ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) ∧ (𝐹‘𝑋) = 𝑍) → ((𝐹‘𝑌) = 𝑍 → 𝑌 = 𝑋))
15	14	necon3d 2957	. . . 4 ⊢ (((𝐹:𝐴–1-1→𝐴 ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) ∧ (𝐹‘𝑋) = 𝑍) → (𝑌 ≠ 𝑋 → (𝐹‘𝑌) ≠ 𝑍))
16	15	3exp1 1350	. . 3 ⊢ (𝐹:𝐴–1-1→𝐴 → (𝑋 ∈ 𝐴 → (𝑌 ∈ 𝐴 → ((𝐹‘𝑋) = 𝑍 → (𝑌 ≠ 𝑋 → (𝐹‘𝑌) ≠ 𝑍)))))
17	3, 4, 16	3syl 18	. 2 ⊢ (𝐹 ∈ 𝐵 → (𝑋 ∈ 𝐴 → (𝑌 ∈ 𝐴 → ((𝐹‘𝑋) = 𝑍 → (𝑌 ≠ 𝑋 → (𝐹‘𝑌) ≠ 𝑍)))))
18	17	3imp 1109	1 ⊢ ((𝐹 ∈ 𝐵 ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → ((𝐹‘𝑋) = 𝑍 → (𝑌 ≠ 𝑋 → (𝐹‘𝑌) ≠ 𝑍)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1085 = wceq 1534 ∈ wcel 2099 ≠ wne 2936 –1-1→wf1 6539 –1-1-onto→wf1o 6541 ‘cfv 6542 Basecbs 17173 SymGrpcsymg 19314

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 2699 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-cnex 11188 ax-resscn 11189 ax-1cn 11190 ax-icn 11191 ax-addcl 11192 ax-addrcl 11193 ax-mulcl 11194 ax-mulrcl 11195 ax-mulcom 11196 ax-addass 11197 ax-mulass 11198 ax-distr 11199 ax-i2m1 11200 ax-1ne0 11201 ax-1rid 11202 ax-rnegex 11203 ax-rrecex 11204 ax-cnre 11205 ax-pre-lttri 11206 ax-pre-lttrn 11207 ax-pre-ltadd 11208 ax-pre-mulgt0 11209

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-reu 3373 df-rab 3429 df-v 3472 df-sbc 3776 df-csb 3891 df-dif 3948 df-un 3950 df-in 3952 df-ss 3962 df-pss 3964 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-tp 4629 df-op 4631 df-uni 4904 df-iun 4993 df-br 5143 df-opab 5205 df-mpt 5226 df-tr 5260 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 6299 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-riota 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 df-om 7865 df-1st 7987 df-2nd 7988 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-1o 8480 df-er 8718 df-map 8840 df-en 8958 df-dom 8959 df-sdom 8960 df-fin 8961 df-pnf 11274 df-mnf 11275 df-xr 11276 df-ltxr 11277 df-le 11278 df-sub 11470 df-neg 11471 df-nn 12237 df-2 12299 df-3 12300 df-4 12301 df-5 12302 df-6 12303 df-7 12304 df-8 12305 df-9 12306 df-n0 12497 df-z 12583 df-uz 12847 df-fz 13511 df-struct 17109 df-sets 17126 df-slot 17144 df-ndx 17156 df-base 17174 df-ress 17203 df-plusg 17239 df-tset 17245 df-efmnd 18814 df-symg 19315

This theorem is referenced by: gsummatr01lem4 22553

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