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| Mirrors > Home > MPE Home > Th. List > Mathboxes > nnsgrpnmnd | Structured version Visualization version GIF version | ||
| Description: The structure of positive integers together with the addition of complex numbers is not a monoid. (Contributed by AV, 4-Feb-2020.) |
| Ref | Expression |
|---|---|
| nnsgrp.m | ⊢ 𝑀 = (ℂfld ↾s ℕ) |
| Ref | Expression |
|---|---|
| nnsgrpnmnd | ⊢ 𝑀 ∉ Mnd |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nnsscn 12258 | . . . 4 ⊢ ℕ ⊆ ℂ | |
| 2 | nnsgrp.m | . . . . 5 ⊢ 𝑀 = (ℂfld ↾s ℕ) | |
| 3 | 2 | cnfldsrngbas 49003 | . . . 4 ⊢ (ℕ ⊆ ℂ → ℕ = (Base‘𝑀)) |
| 4 | 1, 3 | ax-mp 5 | . . 3 ⊢ ℕ = (Base‘𝑀) |
| 5 | nnex 12259 | . . . 4 ⊢ ℕ ∈ V | |
| 6 | 2 | cnfldsrngadd 49004 | . . . 4 ⊢ (ℕ ∈ V → + = (+g‘𝑀)) |
| 7 | 5, 6 | ax-mp 5 | . . 3 ⊢ + = (+g‘𝑀) |
| 8 | 4, 7 | isnmnd 18833 | . 2 ⊢ (∀𝑧 ∈ ℕ ∃𝑥 ∈ ℕ (𝑧 + 𝑥) ≠ 𝑥 → 𝑀 ∉ Mnd) |
| 9 | 1nn 12264 | . . . 4 ⊢ 1 ∈ ℕ | |
| 10 | 9 | a1i 11 | . . 3 ⊢ (𝑧 ∈ ℕ → 1 ∈ ℕ) |
| 11 | oveq2 7428 | . . . . 5 ⊢ (𝑥 = 1 → (𝑧 + 𝑥) = (𝑧 + 1)) | |
| 12 | id 23 | . . . . 5 ⊢ (𝑥 = 1 → 𝑥 = 1) | |
| 13 | 11, 12 | neeq12d 3021 | . . . 4 ⊢ (𝑥 = 1 → ((𝑧 + 𝑥) ≠ 𝑥 ↔ (𝑧 + 1) ≠ 1)) |
| 14 | 13 | adantl 487 | . . 3 ⊢ ((𝑧 ∈ ℕ ∧ 𝑥 = 1) → ((𝑧 + 𝑥) ≠ 𝑥 ↔ (𝑧 + 1) ≠ 1)) |
| 15 | nnne0 12290 | . . . . 5 ⊢ (𝑧 ∈ ℕ → 𝑧 ≠ 0) | |
| 16 | 15 | necomd 3015 | . . . 4 ⊢ (𝑧 ∈ ℕ → 0 ≠ 𝑧) |
| 17 | 1cnd 11222 | . . . . . . 7 ⊢ (𝑧 ∈ ℕ → 1 ∈ ℂ) | |
| 18 | nncn 12261 | . . . . . . 7 ⊢ (𝑧 ∈ ℕ → 𝑧 ∈ ℂ) | |
| 19 | 17, 17, 18 | subadd2d 11608 | . . . . . 6 ⊢ (𝑧 ∈ ℕ → ((1 − 1) = 𝑧 ↔ (𝑧 + 1) = 1)) |
| 20 | 1m1e0 12333 | . . . . . . . 8 ⊢ (1 − 1) = 0 | |
| 21 | 20 | a1i 11 | . . . . . . 7 ⊢ (𝑧 ∈ ℕ → (1 − 1) = 0) |
| 22 | 21 | eqeq1d 2767 | . . . . . 6 ⊢ (𝑧 ∈ ℕ → ((1 − 1) = 𝑧 ↔ 0 = 𝑧)) |
| 23 | 19, 22 | bitr3d 284 | . . . . 5 ⊢ (𝑧 ∈ ℕ → ((𝑧 + 1) = 1 ↔ 0 = 𝑧)) |
| 24 | 23 | necon3bid 3004 | . . . 4 ⊢ (𝑧 ∈ ℕ → ((𝑧 + 1) ≠ 1 ↔ 0 ≠ 𝑧)) |
| 25 | 16, 24 | mpbird 260 | . . 3 ⊢ (𝑧 ∈ ℕ → (𝑧 + 1) ≠ 1) |
| 26 | 10, 14, 25 | rspcedvd 3585 | . 2 ⊢ (𝑧 ∈ ℕ → ∃𝑥 ∈ ℕ (𝑧 + 𝑥) ≠ 𝑥) |
| 27 | 8, 26 | mprg 3087 | 1 ⊢ 𝑀 ∉ Mnd |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 = wceq 1570 ∈ wcel 2146 ≠ wne 2960 ∉ wnel 3066 ∃wrex 3091 Vcvv 3457 ⊆ wss 3906 ‘cfv 6541 (class class class)co 7420 ℂcc 11118 0cc0 11120 1c1 11121 + caddc 11123 − cmin 11461 ℕcn 12253 Basecbs 17296 ↾s cress 17317 +gcplusg 17337 Mndcmnd 18829 ℂfldccnfld 21577 |
| 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 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-sep 5259 ax-nul 5271 ax-pow 5338 ax-pr 5406 ax-un 7743 ax-cnex 11176 ax-resscn 11177 ax-1cn 11178 ax-icn 11179 ax-addcl 11180 ax-addrcl 11181 ax-mulcl 11182 ax-mulrcl 11183 ax-mulcom 11184 ax-addass 11185 ax-mulass 11186 ax-distr 11187 ax-i2m1 11188 ax-1ne0 11189 ax-1rid 11190 ax-rnegex 11191 ax-rrecex 11192 ax-cnre 11193 ax-pre-lttri 11194 ax-pre-lttrn 11195 ax-pre-ltadd 11196 ax-pre-mulgt0 11197 ax-addf 11199 |
| 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 2100 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3067 df-ral 3082 df-rex 3092 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-tp 4596 df-op 4598 df-uni 4875 df-iun 4960 df-br 5112 df-opab 5176 df-mpt 5195 df-tr 5221 df-id 5558 df-eprel 5563 df-po 5571 df-so 5572 df-fr 5616 df-we 5618 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-pred 6307 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6497 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 df-fo 6547 df-f1o 6548 df-fv 6549 df-riota 7377 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7870 df-1st 7993 df-2nd 7994 df-frecs 8285 df-wrecs 8316 df-recs 8365 df-rdg 8404 df-1o 8460 df-er 8701 df-en 8951 df-dom 8952 df-sdom 8953 df-fin 8954 df-pnf 11265 df-mnf 11266 df-xr 11267 df-ltxr 11268 df-le 11269 df-sub 11463 df-neg 11464 df-nn 12254 df-2 12323 df-3 12324 df-4 12325 df-5 12326 df-6 12327 df-7 12328 df-8 12329 df-9 12330 df-n0 12525 df-z 12612 df-dec 12733 df-uz 12884 df-fz 13557 df-struct 17234 df-sets 17251 df-slot 17269 df-ndx 17281 df-base 17297 df-ress 17318 df-plusg 17350 df-mulr 17351 df-starv 17352 df-tset 17356 df-ple 17357 df-ds 17359 df-unif 17360 df-mnd 18830 df-cnfld 21578 |
| This theorem is used by: (None) |
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