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| Mirrors > Home > MPE Home > Th. List > grpss | Structured version Visualization version GIF version | ||
| Description: Show that a structure extending a constructed group (e.g., a ring) is also a group. This allows to prove that a constructed potential ring 𝑅 is a group before we know that it is also a ring. (Theorem ringgrp 20351, on the other hand, requires that we know in advance that 𝑅 is a ring.) (Contributed by NM, 11-Oct-2013.) |
| Ref | Expression |
|---|---|
| grpss.g | ⊢ 𝐺 = {〈(Base‘ndx), 𝐵〉, 〈(+g‘ndx), + 〉} |
| grpss.r | ⊢ 𝑅 ∈ V |
| grpss.s | ⊢ 𝐺 ⊆ 𝑅 |
| grpss.f | ⊢ Fun 𝑅 |
| Ref | Expression |
|---|---|
| grpss | ⊢ (𝐺 ∈ Grp ↔ 𝑅 ∈ Grp) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | grpss.r | . . . 4 ⊢ 𝑅 ∈ V | |
| 2 | grpss.f | . . . 4 ⊢ Fun 𝑅 | |
| 3 | grpss.s | . . . 4 ⊢ 𝐺 ⊆ 𝑅 | |
| 4 | baseid 17297 | . . . 4 ⊢ Base = Slot (Base‘ndx) | |
| 5 | opex 5450 | . . . . . 6 ⊢ 〈(Base‘ndx), 𝐵〉 ∈ V | |
| 6 | 5 | prid1 4733 | . . . . 5 ⊢ 〈(Base‘ndx), 𝐵〉 ∈ {〈(Base‘ndx), 𝐵〉, 〈(+g‘ndx), + 〉} |
| 7 | grpss.g | . . . . 5 ⊢ 𝐺 = {〈(Base‘ndx), 𝐵〉, 〈(+g‘ndx), + 〉} | |
| 8 | 6, 7 | eleqtrri 2865 | . . . 4 ⊢ 〈(Base‘ndx), 𝐵〉 ∈ 𝐺 |
| 9 | 1, 2, 3, 4, 8 | strss 17291 | . . 3 ⊢ (Base‘𝑅) = (Base‘𝐺) |
| 10 | plusgid 17362 | . . . 4 ⊢ +g = Slot (+g‘ndx) | |
| 11 | opex 5450 | . . . . . 6 ⊢ 〈(+g‘ndx), + 〉 ∈ V | |
| 12 | 11 | prid2 4734 | . . . . 5 ⊢ 〈(+g‘ndx), + 〉 ∈ {〈(Base‘ndx), 𝐵〉, 〈(+g‘ndx), + 〉} |
| 13 | 12, 7 | eleqtrri 2865 | . . . 4 ⊢ 〈(+g‘ndx), + 〉 ∈ 𝐺 |
| 14 | 1, 2, 3, 10, 13 | strss 17291 | . . 3 ⊢ (+g‘𝑅) = (+g‘𝐺) |
| 15 | 9, 14 | grpprop 19050 | . 2 ⊢ (𝑅 ∈ Grp ↔ 𝐺 ∈ Grp) |
| 16 | 15 | bicomi 227 | 1 ⊢ (𝐺 ∈ Grp ↔ 𝑅 ∈ Grp) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 = wceq 1570 ∈ wcel 2146 Vcvv 3458 ⊆ wss 3908 {cpr 4596 〈cop 4600 Fun wfun 6537 ‘cfv 6543 ndxcnx 17278 Basecbs 17294 +gcplusg 17335 Grpcgrp 19031 |
| 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 2738 ax-sep 5262 ax-nul 5274 ax-pow 5341 ax-pr 5409 ax-un 7745 ax-cnex 11174 ax-1cn 11176 ax-addcl 11178 |
| 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 2570 df-eu 2600 df-clab 2745 df-cleq 2758 df-clel 2841 df-nfc 2915 df-ne 2962 df-ral 3083 df-rex 3093 df-reu 3373 df-rab 3420 df-v 3460 df-sbc 3748 df-csb 3857 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-pss 3928 df-nul 4290 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4878 df-iun 4963 df-br 5115 df-opab 5179 df-mpt 5198 df-tr 5224 df-id 5561 df-eprel 5566 df-po 5574 df-so 5575 df-fr 5619 df-we 5621 df-xp 5672 df-rel 5673 df-cnv 5674 df-co 5675 df-dm 5676 df-rn 5677 df-res 5678 df-ima 5679 df-pred 6309 df-ord 6370 df-on 6371 df-lim 6372 df-suc 6373 df-iota 6499 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-ov 7426 df-om 7872 df-2nd 7996 df-frecs 8287 df-wrecs 8318 df-recs 8367 df-rdg 8406 df-nn 12252 df-2 12321 df-slot 17267 df-ndx 17279 df-base 17295 df-plusg 17348 df-0g 17519 df-mgm 18723 df-sgrp 18806 df-mnd 18822 df-grp 19034 |
| This theorem is used by: (None) |
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