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| Mirrors > Home > ILE Home > Th. List > isgrpde | GIF version | ||
| Description: Deduce a group from its properties. In this version of isgrpd 13887, we don't assume there is an expression for the inverse of 𝑥. (Contributed by NM, 6-Jan-2015.) |
| Ref | Expression |
|---|---|
| isgrpd.b | ⊢ (𝜑 → 𝐵 = (Base‘𝐺)) |
| isgrpd.p | ⊢ (𝜑 → + = (+g‘𝐺)) |
| isgrpd.c | ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵) → (𝑥 + 𝑦) ∈ 𝐵) |
| isgrpd.a | ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → ((𝑥 + 𝑦) + 𝑧) = (𝑥 + (𝑦 + 𝑧))) |
| isgrpd.z | ⊢ (𝜑 → 0 ∈ 𝐵) |
| isgrpd.i | ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → ( 0 + 𝑥) = 𝑥) |
| isgrpde.n | ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → ∃𝑦 ∈ 𝐵 (𝑦 + 𝑥) = 0 ) |
| Ref | Expression |
|---|---|
| isgrpde | ⊢ (𝜑 → 𝐺 ∈ Grp) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | isgrpd.b | . 2 ⊢ (𝜑 → 𝐵 = (Base‘𝐺)) | |
| 2 | isgrpd.p | . 2 ⊢ (𝜑 → + = (+g‘𝐺)) | |
| 3 | isgrpd.z | . . 3 ⊢ (𝜑 → 0 ∈ 𝐵) | |
| 4 | isgrpd.i | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → ( 0 + 𝑥) = 𝑥) | |
| 5 | isgrpd.c | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵) → (𝑥 + 𝑦) ∈ 𝐵) | |
| 6 | isgrpd.a | . . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → ((𝑥 + 𝑦) + 𝑧) = (𝑥 + (𝑦 + 𝑧))) | |
| 7 | isgrpde.n | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → ∃𝑦 ∈ 𝐵 (𝑦 + 𝑥) = 0 ) | |
| 8 | 5, 3, 4, 6, 7 | grprida 13766 | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → (𝑥 + 0 ) = 𝑥) |
| 9 | 1, 2, 3, 4, 8 | grpidd 13762 | . 2 ⊢ (𝜑 → 0 = (0g‘𝐺)) |
| 10 | 1, 2, 5, 6, 3, 4, 8 | ismndd 13809 | . 2 ⊢ (𝜑 → 𝐺 ∈ Mnd) |
| 11 | 1, 2, 9, 10, 7 | isgrpd2e 13884 | 1 ⊢ (𝜑 → 𝐺 ∈ Grp) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 ∧ w3a 1009 = wceq 1402 ∈ wcel 2209 ∃wrex 2529 ‘cfv 5380 (class class class)co 6088 Basecbs 13410 +gcplusg 13490 Grpcgrp 13864 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4251 ax-pow 4313 ax-pr 4348 ax-un 4580 ax-cnex 8276 ax-resscn 8277 ax-1re 8279 ax-addrcl 8282 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-reu 2535 df-rmo 2536 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-br 4132 df-opab 4194 df-mpt 4195 df-id 4440 df-xp 4782 df-rel 4783 df-cnv 4784 df-co 4785 df-dm 4786 df-rn 4787 df-res 4788 df-iota 5340 df-fun 5382 df-fn 5383 df-fv 5388 df-riota 6041 df-ov 6091 df-inn 9314 df-2 9372 df-ndx 13413 df-slot 13414 df-base 13416 df-plusg 13503 df-0g 13671 df-mgm 13735 df-sgrp 13776 df-mnd 13789 df-grp 13867 |
| This theorem is used by: isgrpd 13887 dfgrp2 13891 imasgrp2 13972 unitgrp 14532 |
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