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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 20497, 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 17422 | . . . 4 ⊢ Base = Slot (Base‘ndx) | |
| 5 | opex 5437 | . . . . . 6 ⊢ 〈(Base‘ndx), 𝐵〉 ∈ V | |
| 6 | 5 | prid1 4723 | . . . . 5 ⊢ 〈(Base‘ndx), 𝐵〉 ∈ {〈(Base‘ndx), 𝐵〉, 〈(+g‘ndx), + 〉} |
| 7 | grpss.g | . . . . 5 ⊢ 𝐺 = {〈(Base‘ndx), 𝐵〉, 〈(+g‘ndx), + 〉} | |
| 8 | 6, 7 | eleqtrri 2863 | . . . 4 ⊢ 〈(Base‘ndx), 𝐵〉 ∈ 𝐺 |
| 9 | 1, 2, 3, 4, 8 | strss 17416 | . . 3 ⊢ (Base‘𝑅) = (Base‘𝐺) |
| 10 | plusgid 17487 | . . . 4 ⊢ +g = Slot (+g‘ndx) | |
| 11 | opex 5437 | . . . . . 6 ⊢ 〈(+g‘ndx), + 〉 ∈ V | |
| 12 | 11 | prid2 4724 | . . . . 5 ⊢ 〈(+g‘ndx), + 〉 ∈ {〈(Base‘ndx), 𝐵〉, 〈(+g‘ndx), + 〉} |
| 13 | 12, 7 | eleqtrri 2863 | . . . 4 ⊢ 〈(+g‘ndx), + 〉 ∈ 𝐺 |
| 14 | 1, 2, 3, 10, 13 | strss 17416 | . . 3 ⊢ (+g‘𝑅) = (+g‘𝐺) |
| 15 | 9, 14 | grpprop 19195 | . 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 2147 Vcvv 3454 ⊆ wss 3900 {cpr 4590 〈cop 4838 Fun wfun 6555 ‘cfv 6561 ndxcnx 17403 Basecbs 17419 +gcplusg 17460 Grpcgrp 19176 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5253 ax-nul 5264 ax-pow 5332 ax-pr 5396 ax-un 7778 ax-cnex 11286 ax-1cn 11288 ax-addcl 11290 |
| 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 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-iun 4956 df-br 5107 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5551 df-eprel 5556 df-po 5564 df-so 5565 df-fr 5609 df-we 5611 df-xp 5662 df-rel 5663 df-cnv 5664 df-co 5665 df-dm 5666 df-rn 5667 df-res 5668 df-ima 5669 df-pred 6325 df-ord 6386 df-on 6387 df-lim 6388 df-suc 6389 df-iota 6515 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-ov 7449 df-om 7905 df-2nd 8029 df-frecs 8330 df-wrecs 8361 df-recs 8410 df-rdg 8449 df-nn 12366 df-2 12435 df-slot 17392 df-ndx 17404 df-base 17420 df-plusg 17473 df-0g 17644 df-mgm 18848 df-sgrp 18940 df-mnd 18956 df-grp 19179 |
| This theorem is used by: (None) |
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