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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 6367 | . . . 4 ⊢ suc 𝐴 = (𝐴 ∪ {𝐴}) | |
| 3 | 1, 2 | eqtri 2792 | . . 3 ⊢ 𝐵 = (𝐴 ∪ {𝐴}) |
| 4 | 3 | fveq2i 6885 | . 2 ⊢ (♯‘𝐵) = (♯‘(𝐴 ∪ {𝐴})) |
| 5 | hashp1i.1 | . . . . 5 ⊢ 𝐴 ∈ ω | |
| 6 | nnfi 9152 | . . . . 5 ⊢ (𝐴 ∈ ω → 𝐴 ∈ Fin) | |
| 7 | 5, 6 | ax-mp 5 | . . . 4 ⊢ 𝐴 ∈ Fin |
| 8 | nnord 7870 | . . . . 5 ⊢ (𝐴 ∈ ω → Ord 𝐴) | |
| 9 | ordirr 6379 | . . . . 5 ⊢ (Ord 𝐴 → ¬ 𝐴 ∈ 𝐴) | |
| 10 | 5, 8, 9 | mp2b 10 | . . . 4 ⊢ ¬ 𝐴 ∈ 𝐴 |
| 11 | hashunsng 14428 | . . . . 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 704 | . . 3 ⊢ (♯‘(𝐴 ∪ {𝐴})) = ((♯‘𝐴) + 1) |
| 14 | hashp1i.3 | . . . . 5 ⊢ (♯‘𝐴) = 𝑀 | |
| 15 | 14 | oveq1i 7421 | . . . 4 ⊢ ((♯‘𝐴) + 1) = (𝑀 + 1) |
| 16 | hashp1i.4 | . . . 4 ⊢ (𝑀 + 1) = 𝑁 | |
| 17 | 15, 16 | eqtri 2792 | . . 3 ⊢ ((♯‘𝐴) + 1) = 𝑁 |
| 18 | 13, 17 | eqtri 2792 | . 2 ⊢ (♯‘(𝐴 ∪ {𝐴})) = 𝑁 |
| 19 | 4, 18 | eqtri 2792 | 1 ⊢ (♯‘𝐵) = 𝑁 |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 400 = wceq 1567 ∈ wcel 2149 ∪ cun 3911 {csn 4594 Ord word 6360 suc csuc 6363 ‘cfv 6537 (class class class)co 7411 ωcom 7862 Fincfn 8943 1c1 11101 + caddc 11103 ♯chash 14366 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-sep 5261 ax-nul 5271 ax-pow 5337 ax-pr 5405 ax-un 7733 ax-cnex 11156 ax-resscn 11157 ax-1cn 11158 ax-icn 11159 ax-addcl 11160 ax-addrcl 11161 ax-mulcl 11162 ax-mulrcl 11163 ax-mulcom 11164 ax-addass 11165 ax-mulass 11166 ax-distr 11167 ax-i2m1 11168 ax-1ne0 11169 ax-1rid 11170 ax-rnegex 11171 ax-rrecex 11172 ax-cnre 11173 ax-pre-lttri 11174 ax-pre-lttrn 11175 ax-pre-ltadd 11176 ax-pre-mulgt0 11177 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-nel 3071 df-ral 3086 df-rex 3096 df-reu 3377 df-rab 3424 df-v 3465 df-sbc 3754 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-pss 3933 df-nul 4295 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4877 df-int 4917 df-iun 4962 df-br 5114 df-opab 5178 df-mpt 5197 df-tr 5223 df-id 5557 df-eprel 5562 df-po 5570 df-so 5571 df-fr 5615 df-we 5617 df-xp 5668 df-rel 5669 df-cnv 5670 df-co 5671 df-dm 5672 df-rn 5673 df-res 5674 df-ima 5675 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7368 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7863 df-1st 7986 df-2nd 7987 df-frecs 8278 df-wrecs 8309 df-recs 8358 df-rdg 8397 df-1o 8453 df-oadd 8457 df-er 8694 df-en 8944 df-dom 8945 df-sdom 8946 df-fin 8947 df-dju 9887 df-card 9925 df-pnf 11245 df-mnf 11246 df-xr 11247 df-ltxr 11248 df-le 11249 df-sub 11443 df-neg 11444 df-nn 12234 df-n0 12505 df-z 12592 df-uz 12863 df-fz 13536 df-hash 14367 |
| This theorem is referenced by: hash1 14440 hash2 14441 hash3 14442 hash4 14443 |
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