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| Mirrors > Home > MPE Home > Th. List > efmnd1hash | Structured version Visualization version GIF version | ||
| Description: The monoid of endofunctions on a singleton has cardinality 1. (Contributed by AV, 27-Jan-2024.) |
| Ref | Expression |
|---|---|
| efmnd1bas.1 | ⊢ 𝐺 = (EndoFMnd‘𝐴) |
| efmnd1bas.2 | ⊢ 𝐵 = (Base‘𝐺) |
| efmnd1bas.0 | ⊢ 𝐴 = {𝐼} |
| Ref | Expression |
|---|---|
| efmnd1hash | ⊢ (𝐼 ∈ 𝑉 → (♯‘𝐵) = 1) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | efmnd1bas.0 | . . . 4 ⊢ 𝐴 = {𝐼} | |
| 2 | snfi 8987 | . . . 4 ⊢ {𝐼} ∈ Fin | |
| 3 | 1, 2 | eqeltri 2836 | . . 3 ⊢ 𝐴 ∈ Fin |
| 4 | efmnd1bas.1 | . . . 4 ⊢ 𝐺 = (EndoFMnd‘𝐴) | |
| 5 | efmnd1bas.2 | . . . 4 ⊢ 𝐵 = (Base‘𝐺) | |
| 6 | 4, 5 | efmndhash 18842 | . . 3 ⊢ (𝐴 ∈ Fin → (♯‘𝐵) = ((♯‘𝐴)↑(♯‘𝐴))) |
| 7 | 3, 6 | ax-mp 5 | . 2 ⊢ (♯‘𝐵) = ((♯‘𝐴)↑(♯‘𝐴)) |
| 8 | 1 | fveq2i 6837 | . . . . 5 ⊢ (♯‘𝐴) = (♯‘{𝐼}) |
| 9 | hashsng 14329 | . . . . 5 ⊢ (𝐼 ∈ 𝑉 → (♯‘{𝐼}) = 1) | |
| 10 | 8, 9 | eqtrid 2787 | . . . 4 ⊢ (𝐼 ∈ 𝑉 → (♯‘𝐴) = 1) |
| 11 | 10, 10 | oveq12d 7381 | . . 3 ⊢ (𝐼 ∈ 𝑉 → ((♯‘𝐴)↑(♯‘𝐴)) = (1↑1)) |
| 12 | 1z 12555 | . . . 4 ⊢ 1 ∈ ℤ | |
| 13 | 1exp 14051 | . . . 4 ⊢ (1 ∈ ℤ → (1↑1) = 1) | |
| 14 | 12, 13 | ax-mp 5 | . . 3 ⊢ (1↑1) = 1 |
| 15 | 11, 14 | eqtrdi 2791 | . 2 ⊢ (𝐼 ∈ 𝑉 → ((♯‘𝐴)↑(♯‘𝐴)) = 1) |
| 16 | 7, 15 | eqtrid 2787 | 1 ⊢ (𝐼 ∈ 𝑉 → (♯‘𝐵) = 1) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1547 ∈ wcel 2119 {csn 4562 ‘cfv 6492 (class class class)co 7363 Fincfn 8890 1c1 11037 ℤcz 12522 ↑cexp 14021 ♯chash 14290 Basecbs 17177 EndoFMndcefmnd 18834 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2712 ax-sep 5225 ax-nul 5235 ax-pow 5301 ax-pr 5369 ax-un 7685 ax-cnex 11092 ax-resscn 11093 ax-1cn 11094 ax-icn 11095 ax-addcl 11096 ax-addrcl 11097 ax-mulcl 11098 ax-mulrcl 11099 ax-mulcom 11100 ax-addass 11101 ax-mulass 11102 ax-distr 11103 ax-i2m1 11104 ax-1ne0 11105 ax-1rid 11106 ax-rnegex 11107 ax-rrecex 11108 ax-cnre 11109 ax-pre-lttri 11110 ax-pre-lttrn 11111 ax-pre-ltadd 11112 ax-pre-mulgt0 11113 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3or 1093 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2719 df-cleq 2732 df-clel 2815 df-nfc 2889 df-ne 2936 df-nel 3040 df-ral 3055 df-rex 3065 df-rmo 3345 df-reu 3346 df-rab 3393 df-v 3434 df-sbc 3731 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4269 df-if 4462 df-pw 4538 df-sn 4563 df-pr 4565 df-tp 4567 df-op 4569 df-uni 4846 df-int 4885 df-iun 4930 df-br 5080 df-opab 5142 df-mpt 5161 df-tr 5187 df-id 5520 df-eprel 5525 df-po 5533 df-so 5534 df-fr 5578 df-we 5580 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-ima 5638 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7320 df-ov 7366 df-oprab 7367 df-mpo 7368 df-om 7814 df-1st 7938 df-2nd 7939 df-frecs 8228 df-wrecs 8259 df-recs 8308 df-rdg 8346 df-1o 8402 df-oadd 8406 df-er 8640 df-map 8772 df-pm 8773 df-en 8891 df-dom 8892 df-sdom 8893 df-fin 8894 df-dju 9823 df-card 9861 df-pnf 11179 df-mnf 11180 df-xr 11181 df-ltxr 11182 df-le 11183 df-sub 11377 df-neg 11378 df-div 11806 df-nn 12173 df-2 12242 df-3 12243 df-4 12244 df-5 12245 df-6 12246 df-7 12247 df-8 12248 df-9 12249 df-n0 12436 df-z 12523 df-uz 12787 df-fz 13460 df-seq 13962 df-exp 14022 df-hash 14291 df-struct 17115 df-slot 17150 df-ndx 17162 df-base 17178 df-plusg 17231 df-tset 17237 df-efmnd 18835 |
| This theorem is referenced by: (None) |
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