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| Mirrors > Home > MPE Home > Th. List > Mathboxes > hashnnsuc | Structured version Visualization version GIF version | ||
| Description: The ♯ function on ω turns successor into adding 1. (Contributed by Eric Schmidt, 7-Jul-2026.) |
| Ref | Expression |
|---|---|
| hashnnsuc | ⊢ (𝐴 ∈ ω → (♯‘suc 𝐴) = ((♯‘𝐴) + 1)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nnon 7856 | . . . . 5 ⊢ (𝐴 ∈ ω → 𝐴 ∈ On) | |
| 2 | oa1suc 8504 | . . . . 5 ⊢ (𝐴 ∈ On → (𝐴 +o 1o) = suc 𝐴) | |
| 3 | 1, 2 | syl 18 | . . . 4 ⊢ (𝐴 ∈ ω → (𝐴 +o 1o) = suc 𝐴) |
| 4 | 3 | fveq2d 6875 | . . 3 ⊢ (𝐴 ∈ ω → (♯‘(𝐴 +o 1o)) = (♯‘suc 𝐴)) |
| 5 | 1onn 8614 | . . . 4 ⊢ 1o ∈ ω | |
| 6 | hashnna 45587 | . . . 4 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ ω) → (♯‘(𝐴 +o 1o)) = ((♯‘𝐴) + (♯‘1o))) | |
| 7 | 5, 6 | mpan2 703 | . . 3 ⊢ (𝐴 ∈ ω → (♯‘(𝐴 +o 1o)) = ((♯‘𝐴) + (♯‘1o))) |
| 8 | 4, 7 | eqtr3d 2802 | . 2 ⊢ (𝐴 ∈ ω → (♯‘suc 𝐴) = ((♯‘𝐴) + (♯‘1o))) |
| 9 | hash1 14428 | . . 3 ⊢ (♯‘1o) = 1 | |
| 10 | 9 | oveq2i 7411 | . 2 ⊢ ((♯‘𝐴) + (♯‘1o)) = ((♯‘𝐴) + 1) |
| 11 | 8, 10 | eqtrdi 2816 | 1 ⊢ (𝐴 ∈ ω → (♯‘suc 𝐴) = ((♯‘𝐴) + 1)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1563 ∈ wcel 2145 Oncon0 6349 suc csuc 6351 ‘cfv 6525 (class class class)co 7400 ωcom 7850 1oc1o 8434 +o coa 8438 1c1 11089 + caddc 11091 ♯chash 14354 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2737 ax-sep 5250 ax-nul 5260 ax-pow 5326 ax-pr 5394 ax-un 7722 ax-cnex 11144 ax-resscn 11145 ax-1cn 11146 ax-icn 11147 ax-addcl 11148 ax-addrcl 11149 ax-mulcl 11150 ax-mulrcl 11151 ax-mulcom 11152 ax-addass 11153 ax-mulass 11154 ax-distr 11155 ax-i2m1 11156 ax-1ne0 11157 ax-1rid 11158 ax-rnegex 11159 ax-rrecex 11160 ax-cnre 11161 ax-pre-lttri 11162 ax-pre-lttrn 11163 ax-pre-ltadd 11164 ax-pre-mulgt0 11165 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1566 df-fal 1576 df-ex 1803 df-nf 1807 df-sb 2094 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3065 df-ral 3080 df-rex 3090 df-reu 3371 df-rab 3418 df-v 3459 df-sbc 3748 df-csb 3856 df-dif 3910 df-un 3912 df-in 3914 df-ss 3924 df-pss 3927 df-nul 4289 df-if 4484 df-pw 4560 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4868 df-int 4908 df-iun 4953 df-br 5105 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6291 df-ord 6352 df-on 6353 df-lim 6354 df-suc 6355 df-iota 6481 df-fun 6527 df-fn 6528 df-f 6529 df-f1 6530 df-fo 6531 df-f1o 6532 df-fv 6533 df-riota 7357 df-ov 7403 df-oprab 7404 df-mpo 7405 df-om 7851 df-1st 7974 df-2nd 7975 df-frecs 8266 df-wrecs 8297 df-recs 8346 df-rdg 8385 df-1o 8441 df-oadd 8445 df-er 8682 df-en 8932 df-dom 8933 df-sdom 8934 df-fin 8935 df-dju 9875 df-card 9913 df-pnf 11233 df-mnf 11234 df-xr 11235 df-ltxr 11236 df-le 11237 df-sub 11431 df-neg 11432 df-nn 12222 df-n0 12493 df-xnn0 12566 df-z 12580 df-uz 12851 df-fz 13524 df-hash 14355 |
| This theorem is referenced by: (None) |
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