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Mirrors > Home > MPE Home > Th. List > rneqdmfinf1o | Structured version Visualization version GIF version |
Description: Any function from a finite set onto the same set must be a bijection. (Contributed by AV, 5-Jul-2021.) |
Ref | Expression |
---|---|
rneqdmfinf1o | ⊢ ((𝐴 ∈ Fin ∧ 𝐹 Fn 𝐴 ∧ ran 𝐹 = 𝐴) → 𝐹:𝐴–1-1-onto→𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dffn4 6628 | . . . . 5 ⊢ (𝐹 Fn 𝐴 ↔ 𝐹:𝐴–onto→ran 𝐹) | |
2 | 1 | biimpi 219 | . . . 4 ⊢ (𝐹 Fn 𝐴 → 𝐹:𝐴–onto→ran 𝐹) |
3 | 2 | 3ad2ant2 1136 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐹 Fn 𝐴 ∧ ran 𝐹 = 𝐴) → 𝐹:𝐴–onto→ran 𝐹) |
4 | foeq3 6620 | . . . 4 ⊢ (ran 𝐹 = 𝐴 → (𝐹:𝐴–onto→ran 𝐹 ↔ 𝐹:𝐴–onto→𝐴)) | |
5 | 4 | 3ad2ant3 1137 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐹 Fn 𝐴 ∧ ran 𝐹 = 𝐴) → (𝐹:𝐴–onto→ran 𝐹 ↔ 𝐹:𝐴–onto→𝐴)) |
6 | 3, 5 | mpbid 235 | . 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐹 Fn 𝐴 ∧ ran 𝐹 = 𝐴) → 𝐹:𝐴–onto→𝐴) |
7 | enrefg 8649 | . . 3 ⊢ (𝐴 ∈ Fin → 𝐴 ≈ 𝐴) | |
8 | 7 | 3ad2ant1 1135 | . 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐹 Fn 𝐴 ∧ ran 𝐹 = 𝐴) → 𝐴 ≈ 𝐴) |
9 | simp1 1138 | . 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐹 Fn 𝐴 ∧ ran 𝐹 = 𝐴) → 𝐴 ∈ Fin) | |
10 | fofinf1o 8940 | . 2 ⊢ ((𝐹:𝐴–onto→𝐴 ∧ 𝐴 ≈ 𝐴 ∧ 𝐴 ∈ Fin) → 𝐹:𝐴–1-1-onto→𝐴) | |
11 | 6, 8, 9, 10 | syl3anc 1373 | 1 ⊢ ((𝐴 ∈ Fin ∧ 𝐹 Fn 𝐴 ∧ ran 𝐹 = 𝐴) → 𝐹:𝐴–1-1-onto→𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∧ w3a 1089 = wceq 1543 ∈ wcel 2110 class class class wbr 5043 ran crn 5541 Fn wfn 6364 –onto→wfo 6367 –1-1-onto→wf1o 6368 ≈ cen 8612 Fincfn 8615 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2016 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2158 ax-12 2175 ax-ext 2706 ax-sep 5181 ax-nul 5188 ax-pow 5247 ax-pr 5311 ax-un 7512 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3or 1090 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2071 df-mo 2537 df-eu 2566 df-clab 2713 df-cleq 2726 df-clel 2812 df-nfc 2882 df-ne 2936 df-ral 3059 df-rex 3060 df-reu 3061 df-rab 3063 df-v 3403 df-sbc 3688 df-dif 3860 df-un 3862 df-in 3864 df-ss 3874 df-pss 3876 df-nul 4228 df-if 4430 df-pw 4505 df-sn 4532 df-pr 4534 df-tp 4536 df-op 4538 df-uni 4810 df-br 5044 df-opab 5106 df-mpt 5125 df-tr 5151 df-id 5444 df-eprel 5449 df-po 5457 df-so 5458 df-fr 5498 df-we 5500 df-xp 5546 df-rel 5547 df-cnv 5548 df-co 5549 df-dm 5550 df-rn 5551 df-res 5552 df-ima 5553 df-ord 6205 df-on 6206 df-lim 6207 df-suc 6208 df-iota 6327 df-fun 6371 df-fn 6372 df-f 6373 df-f1 6374 df-fo 6375 df-f1o 6376 df-fv 6377 df-om 7634 df-1o 8191 df-er 8380 df-en 8616 df-dom 8617 df-sdom 8618 df-fin 8619 |
This theorem is referenced by: gausslemma2dlem1 26219 |
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