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| Mirrors > Home > MPE Home > Th. List > hashresfn | Structured version Visualization version GIF version | ||
| Description: Restriction of the domain of the size function. (Contributed by Thierry Arnoux, 31-Jan-2017.) |
| Ref | Expression |
|---|---|
| hashresfn | ⊢ (♯ ↾ 𝐴) Fn 𝐴 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | hashf 14237 | . . 3 ⊢ ♯:V⟶(ℕ0 ∪ {+∞}) | |
| 2 | ffn 6647 | . . 3 ⊢ (♯:V⟶(ℕ0 ∪ {+∞}) → ♯ Fn V) | |
| 3 | fnresin2 6603 | . . 3 ⊢ (♯ Fn V → (♯ ↾ (𝐴 ∩ V)) Fn (𝐴 ∩ V)) | |
| 4 | 1, 2, 3 | mp2b 10 | . 2 ⊢ (♯ ↾ (𝐴 ∩ V)) Fn (𝐴 ∩ V) |
| 5 | inv1 4346 | . . . 4 ⊢ (𝐴 ∩ V) = 𝐴 | |
| 6 | 5 | reseq2i 5922 | . . 3 ⊢ (♯ ↾ (𝐴 ∩ V)) = (♯ ↾ 𝐴) |
| 7 | fneq12 6573 | . . 3 ⊢ (((♯ ↾ (𝐴 ∩ V)) = (♯ ↾ 𝐴) ∧ (𝐴 ∩ V) = 𝐴) → ((♯ ↾ (𝐴 ∩ V)) Fn (𝐴 ∩ V) ↔ (♯ ↾ 𝐴) Fn 𝐴)) | |
| 8 | 6, 5, 7 | mp2an 692 | . 2 ⊢ ((♯ ↾ (𝐴 ∩ V)) Fn (𝐴 ∩ V) ↔ (♯ ↾ 𝐴) Fn 𝐴) |
| 9 | 4, 8 | mpbi 230 | 1 ⊢ (♯ ↾ 𝐴) Fn 𝐴 |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 = wceq 1541 Vcvv 3434 ∪ cun 3898 ∩ cin 3899 {csn 4574 ↾ cres 5616 Fn wfn 6472 ⟶wf 6473 +∞cpnf 11135 ℕ0cn0 12373 ♯chash 14229 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2112 ax-9 2120 ax-10 2143 ax-11 2159 ax-12 2179 ax-ext 2702 ax-sep 5232 ax-nul 5242 ax-pow 5301 ax-pr 5368 ax-un 7663 ax-cnex 11054 ax-resscn 11055 ax-1cn 11056 ax-icn 11057 ax-addcl 11058 ax-addrcl 11059 ax-mulcl 11060 ax-mulrcl 11061 ax-mulcom 11062 ax-addass 11063 ax-mulass 11064 ax-distr 11065 ax-i2m1 11066 ax-1ne0 11067 ax-1rid 11068 ax-rnegex 11069 ax-rrecex 11070 ax-cnre 11071 ax-pre-lttri 11072 ax-pre-lttrn 11073 ax-pre-ltadd 11074 ax-pre-mulgt0 11075 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2067 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-nel 3031 df-ral 3046 df-rex 3055 df-reu 3345 df-rab 3394 df-v 3436 df-sbc 3740 df-csb 3849 df-dif 3903 df-un 3905 df-in 3907 df-ss 3917 df-pss 3920 df-nul 4282 df-if 4474 df-pw 4550 df-sn 4575 df-pr 4577 df-op 4581 df-uni 4858 df-int 4896 df-iun 4941 df-br 5090 df-opab 5152 df-mpt 5171 df-tr 5197 df-id 5509 df-eprel 5514 df-po 5522 df-so 5523 df-fr 5567 df-we 5569 df-xp 5620 df-rel 5621 df-cnv 5622 df-co 5623 df-dm 5624 df-rn 5625 df-res 5626 df-ima 5627 df-pred 6244 df-ord 6305 df-on 6306 df-lim 6307 df-suc 6308 df-iota 6433 df-fun 6479 df-fn 6480 df-f 6481 df-f1 6482 df-fo 6483 df-f1o 6484 df-fv 6485 df-riota 7298 df-ov 7344 df-oprab 7345 df-mpo 7346 df-om 7792 df-2nd 7917 df-frecs 8206 df-wrecs 8237 df-recs 8286 df-rdg 8324 df-1o 8380 df-er 8617 df-en 8865 df-dom 8866 df-sdom 8867 df-fin 8868 df-card 9824 df-pnf 11140 df-mnf 11141 df-xr 11142 df-ltxr 11143 df-le 11144 df-sub 11338 df-neg 11339 df-nn 12118 df-n0 12374 df-xnn0 12447 df-z 12461 df-uz 12725 df-hash 14230 |
| This theorem is referenced by: hashgval2 14277 coinfliplem 34482 coinflipspace 34484 |
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