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| Mirrors > Home > MPE Home > Th. List > hashp1i | Structured version Visualization version GIF version | ||
| Description: Size of a finite ordinal. (Contributed by Mario Carneiro, 5-Jan-2016.) |
| Ref | Expression |
|---|---|
| hashp1i.1 | ⊢ 𝐴 ∈ ω |
| hashp1i.2 | ⊢ 𝐵 = suc 𝐴 |
| hashp1i.3 | ⊢ (♯‘𝐴) = 𝑀 |
| hashp1i.4 | ⊢ (𝑀 + 1) = 𝑁 |
| Ref | Expression |
|---|---|
| hashp1i | ⊢ (♯‘𝐵) = 𝑁 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | hashp1i.2 | . . . 4 ⊢ 𝐵 = suc 𝐴 | |
| 2 | df-suc 6394 | . . . 4 ⊢ suc 𝐴 = (𝐴 ∪ {𝐴}) | |
| 3 | 1, 2 | eqtri 2786 | . . 3 ⊢ 𝐵 = (𝐴 ∪ {𝐴}) |
| 4 | 3 | fveq2i 6919 | . 2 ⊢ (♯‘𝐵) = (♯‘(𝐴 ∪ {𝐴})) |
| 5 | hashp1i.1 | . . . . 5 ⊢ 𝐴 ∈ ω | |
| 6 | nnfi 9221 | . . . . 5 ⊢ (𝐴 ∈ ω → 𝐴 ∈ Fin) | |
| 7 | 5, 6 | ax-mp 5 | . . . 4 ⊢ 𝐴 ∈ Fin |
| 8 | nnord 7919 | . . . . 5 ⊢ (𝐴 ∈ ω → Ord 𝐴) | |
| 9 | ordirr 6406 | . . . . 5 ⊢ (Ord 𝐴 → ¬ 𝐴 ∈ 𝐴) | |
| 10 | 5, 8, 9 | mp2b 10 | . . . 4 ⊢ ¬ 𝐴 ∈ 𝐴 |
| 11 | hashunsng 14577 | . . . . 5 ⊢ (𝐴 ∈ ω → ((𝐴 ∈ Fin ∧ ¬ 𝐴 ∈ 𝐴) → (♯‘(𝐴 ∪ {𝐴})) = ((♯‘𝐴) + 1))) | |
| 12 | 5, 11 | ax-mp 5 | . . . 4 ⊢ ((𝐴 ∈ Fin ∧ ¬ 𝐴 ∈ 𝐴) → (♯‘(𝐴 ∪ {𝐴})) = ((♯‘𝐴) + 1)) |
| 13 | 7, 10, 12 | mp2an 705 | . . 3 ⊢ (♯‘(𝐴 ∪ {𝐴})) = ((♯‘𝐴) + 1) |
| 14 | hashp1i.3 | . . . . 5 ⊢ (♯‘𝐴) = 𝑀 | |
| 15 | 14 | oveq1i 7461 | . . . 4 ⊢ ((♯‘𝐴) + 1) = (𝑀 + 1) |
| 16 | hashp1i.4 | . . . 4 ⊢ (𝑀 + 1) = 𝑁 | |
| 17 | 15, 16 | eqtri 2786 | . . 3 ⊢ ((♯‘𝐴) + 1) = 𝑁 |
| 18 | 13, 17 | eqtri 2786 | . 2 ⊢ (♯‘(𝐴 ∪ {𝐴})) = 𝑁 |
| 19 | 4, 18 | eqtri 2786 | 1 ⊢ (♯‘𝐵) = 𝑁 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2147 ∪ cun 4152 {csn 4588 Ord word 6387 suc csuc 6390 ‘cfv 6566 (class class class)co 7451 ωcom 7911 Fincfn 9011 1c1 11240 + caddc 11242 ♯chash 14515 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5255 ax-nul 5266 ax-pow 5334 ax-pr 5398 ax-un 7783 ax-cnex 11295 ax-resscn 11296 ax-1cn 11297 ax-icn 11298 ax-addcl 11299 ax-addrcl 11300 ax-mulcl 11301 ax-mulrcl 11302 ax-mulcom 11303 ax-addass 11304 ax-mulass 11305 ax-distr 11306 ax-i2m1 11307 ax-1ne0 11308 ax-1rid 11309 ax-rnegex 11310 ax-rrecex 11311 ax-cnre 11312 ax-pre-lttri 11313 ax-pre-lttrn 11314 ax-pre-ltadd 11315 ax-pre-mulgt0 11316 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-int 4913 df-iun 4958 df-br 5109 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5553 df-eprel 5558 df-po 5566 df-so 5567 df-fr 5611 df-we 5613 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-pred 6330 df-ord 6391 df-on 6392 df-lim 6393 df-suc 6394 df-iota 6520 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-fv 6574 df-riota 7408 df-ov 7454 df-oprab 7455 df-mpo 7456 df-om 7912 df-1st 8035 df-2nd 8036 df-frecs 8337 df-wrecs 8368 df-recs 8417 df-rdg 8456 df-1o 8514 df-oadd 8518 df-er 8755 df-en 9012 df-dom 9013 df-sdom 9014 df-fin 9015 df-dju 10019 df-card 10057 df-pnf 11384 df-mnf 11385 df-xr 11386 df-ltxr 11387 df-le 11388 df-sub 11582 df-neg 11583 df-nn 12376 df-n0 12647 df-z 12734 df-uz 13006 df-fz 13680 df-hash 14516 |
| This theorem is used by: hash1 14589 hash2 14590 hash3 14591 hash4 14592 |
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