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Mirrors > Home > MPE Home > Th. List > Mathboxes > f1rnen | Structured version Visualization version GIF version |
Description: Equinumerosity of the range of an injective function. (Contributed by Thierry Arnoux, 7-Jul-2023.) |
Ref | Expression |
---|---|
f1rnen | ⊢ ((𝐹:𝐴–1-1→𝐵 ∧ 𝐴 ∈ 𝑉) → ran 𝐹 ≈ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | f1fn 6569 | . . . 4 ⊢ (𝐹:𝐴–1-1→𝐵 → 𝐹 Fn 𝐴) | |
2 | 1 | adantr 483 | . . 3 ⊢ ((𝐹:𝐴–1-1→𝐵 ∧ 𝐴 ∈ 𝑉) → 𝐹 Fn 𝐴) |
3 | fnima 6471 | . . 3 ⊢ (𝐹 Fn 𝐴 → (𝐹 “ 𝐴) = ran 𝐹) | |
4 | 2, 3 | syl 17 | . 2 ⊢ ((𝐹:𝐴–1-1→𝐵 ∧ 𝐴 ∈ 𝑉) → (𝐹 “ 𝐴) = ran 𝐹) |
5 | ssid 3982 | . . 3 ⊢ 𝐴 ⊆ 𝐴 | |
6 | f1imaeng 8562 | . . 3 ⊢ ((𝐹:𝐴–1-1→𝐵 ∧ 𝐴 ⊆ 𝐴 ∧ 𝐴 ∈ 𝑉) → (𝐹 “ 𝐴) ≈ 𝐴) | |
7 | 5, 6 | mp3an2 1444 | . 2 ⊢ ((𝐹:𝐴–1-1→𝐵 ∧ 𝐴 ∈ 𝑉) → (𝐹 “ 𝐴) ≈ 𝐴) |
8 | 4, 7 | eqbrtrrd 5083 | 1 ⊢ ((𝐹:𝐴–1-1→𝐵 ∧ 𝐴 ∈ 𝑉) → ran 𝐹 ≈ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = wceq 1536 ∈ wcel 2113 ⊆ wss 3929 class class class wbr 5059 ran crn 5549 “ cima 5551 Fn wfn 6343 –1-1→wf1 6345 ≈ cen 8499 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2792 ax-rep 5183 ax-sep 5196 ax-nul 5203 ax-pow 5259 ax-pr 5323 ax-un 7454 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1084 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-mo 2621 df-eu 2653 df-clab 2799 df-cleq 2813 df-clel 2892 df-nfc 2962 df-ne 3016 df-ral 3142 df-rex 3143 df-reu 3144 df-rab 3146 df-v 3493 df-sbc 3769 df-csb 3877 df-dif 3932 df-un 3934 df-in 3936 df-ss 3945 df-nul 4285 df-if 4461 df-pw 4534 df-sn 4561 df-pr 4563 df-op 4567 df-uni 4832 df-iun 4914 df-br 5060 df-opab 5122 df-mpt 5140 df-id 5453 df-xp 5554 df-rel 5555 df-cnv 5556 df-co 5557 df-dm 5558 df-rn 5559 df-res 5560 df-ima 5561 df-iota 6307 df-fun 6350 df-fn 6351 df-f 6352 df-f1 6353 df-fo 6354 df-f1o 6355 df-fv 6356 df-er 8282 df-en 8503 |
This theorem is referenced by: fedgmul 31049 |
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