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| Mirrors > Home > MPE Home > Th. List > 0subgALT | Structured version Visualization version GIF version | ||
| Description: A shorter proof of 0subg 19213 using df-od 19593. (Contributed by SN, 31-Jan-2025.) (Proof modification is discouraged.) (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| 0subgALT.z | ⊢ 0 = (0g‘𝐺) |
| Ref | Expression |
|---|---|
| 0subgALT | ⊢ (𝐺 ∈ Grp → { 0 } ∈ (SubGrp‘𝐺)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2763 | . 2 ⊢ (od‘𝐺) = (od‘𝐺) | |
| 2 | id 23 | . 2 ⊢ (𝐺 ∈ Grp → 𝐺 ∈ Grp) | |
| 3 | grpmnd 19002 | . . 3 ⊢ (𝐺 ∈ Grp → 𝐺 ∈ Mnd) | |
| 4 | 0subgALT.z | . . . 4 ⊢ 0 = (0g‘𝐺) | |
| 5 | 4 | 0subm 18871 | . . 3 ⊢ (𝐺 ∈ Mnd → { 0 } ∈ (SubMnd‘𝐺)) |
| 6 | 3, 5 | syl 18 | . 2 ⊢ (𝐺 ∈ Grp → { 0 } ∈ (SubMnd‘𝐺)) |
| 7 | 1, 4 | od1 19624 | . . . 4 ⊢ (𝐺 ∈ Grp → ((od‘𝐺)‘ 0 ) = 1) |
| 8 | 1nn 12239 | . . . 4 ⊢ 1 ∈ ℕ | |
| 9 | 7, 8 | eqeltrdi 2871 | . . 3 ⊢ (𝐺 ∈ Grp → ((od‘𝐺)‘ 0 ) ∈ ℕ) |
| 10 | 4 | fvexi 6895 | . . . 4 ⊢ 0 ∈ V |
| 11 | fveq2 6881 | . . . . 5 ⊢ (𝑎 = 0 → ((od‘𝐺)‘𝑎) = ((od‘𝐺)‘ 0 )) | |
| 12 | 11 | eleq1d 2848 | . . . 4 ⊢ (𝑎 = 0 → (((od‘𝐺)‘𝑎) ∈ ℕ ↔ ((od‘𝐺)‘ 0 ) ∈ ℕ)) |
| 13 | 10, 12 | ralsn 4647 | . . 3 ⊢ (∀𝑎 ∈ { 0 } ((od‘𝐺)‘𝑎) ∈ ℕ ↔ ((od‘𝐺)‘ 0 ) ∈ ℕ) |
| 14 | 9, 13 | sylibr 237 | . 2 ⊢ (𝐺 ∈ Grp → ∀𝑎 ∈ { 0 } ((od‘𝐺)‘𝑎) ∈ ℕ) |
| 15 | 1, 2, 6, 14 | finodsubmsubg 19632 | 1 ⊢ (𝐺 ∈ Grp → { 0 } ∈ (SubGrp‘𝐺)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1570 ∈ wcel 2143 ∀wral 3079 {csn 4589 ‘cfv 6536 1c1 11096 ℕcn 12228 0gc0g 17487 Mndcmnd 18787 SubMndcsubmnd 18835 Grpcgrp 18995 SubGrpcsubg 19181 odcod 19589 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-sep 5257 ax-nul 5269 ax-pow 5336 ax-pr 5404 ax-un 7732 ax-cnex 11151 ax-resscn 11152 ax-1cn 11153 ax-icn 11154 ax-addcl 11155 ax-addrcl 11156 ax-mulcl 11157 ax-mulrcl 11158 ax-mulcom 11159 ax-addass 11160 ax-mulass 11161 ax-distr 11162 ax-i2m1 11163 ax-1ne0 11164 ax-1rid 11165 ax-rnegex 11166 ax-rrecex 11167 ax-cnre 11168 ax-pre-lttri 11169 ax-pre-lttrn 11170 ax-pre-ltadd 11171 ax-pre-mulgt0 11172 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-nel 3065 df-ral 3080 df-rex 3090 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3457 df-sbc 3745 df-csb 3854 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-pss 3925 df-nul 4287 df-if 4488 df-pw 4564 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4873 df-iun 4958 df-br 5110 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5556 df-eprel 5561 df-po 5569 df-so 5570 df-fr 5614 df-we 5616 df-xp 5667 df-rel 5668 df-cnv 5669 df-co 5670 df-dm 5671 df-rn 5672 df-res 5673 df-ima 5674 df-pred 6302 df-ord 6363 df-on 6364 df-lim 6365 df-suc 6366 df-iota 6492 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-riota 7367 df-ov 7413 df-oprab 7414 df-mpo 7415 df-om 7859 df-1st 7982 df-2nd 7983 df-frecs 8274 df-wrecs 8305 df-recs 8354 df-rdg 8393 df-er 8690 df-en 8940 df-dom 8941 df-sdom 8942 df-sup 9398 df-inf 9399 df-pnf 11240 df-mnf 11241 df-xr 11242 df-ltxr 11243 df-le 11244 df-sub 11438 df-neg 11439 df-nn 12229 df-2 12298 df-n0 12500 df-z 12587 df-uz 12858 df-fz 13531 df-seq 14034 df-sets 17219 df-slot 17237 df-ndx 17249 df-base 17265 df-ress 17286 df-plusg 17318 df-0g 17489 df-mgm 18693 df-sgrp 18772 df-mnd 18788 df-submnd 18837 df-grp 18998 df-minusg 18999 df-sbg 19000 df-mulg 19129 df-subg 19184 df-od 19593 |
| This theorem is referenced by: (None) |
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