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Mirrors > Home > ILE Home > Th. List > 1unit | GIF version |
Description: The multiplicative identity is a unit. (Contributed by Mario Carneiro, 1-Dec-2014.) |
Ref | Expression |
---|---|
unit.1 | β’ π = (Unitβπ ) |
unit.2 | β’ 1 = (1rβπ ) |
Ref | Expression |
---|---|
1unit | β’ (π β Ring β 1 β π) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2177 | . . . 4 β’ (Baseβπ ) = (Baseβπ ) | |
2 | unit.2 | . . . 4 β’ 1 = (1rβπ ) | |
3 | 1, 2 | ringidcl 13201 | . . 3 β’ (π β Ring β 1 β (Baseβπ )) |
4 | eqid 2177 | . . . 4 β’ (β₯rβπ ) = (β₯rβπ ) | |
5 | 1, 4 | dvdsrid 13267 | . . 3 β’ ((π β Ring β§ 1 β (Baseβπ )) β 1 (β₯rβπ ) 1 ) |
6 | 3, 5 | mpdan 421 | . 2 β’ (π β Ring β 1 (β₯rβπ ) 1 ) |
7 | eqid 2177 | . . . 4 β’ (opprβπ ) = (opprβπ ) | |
8 | 7 | opprring 13247 | . . 3 β’ (π β Ring β (opprβπ ) β Ring) |
9 | 7, 1 | opprbasg 13245 | . . . 4 β’ (π β Ring β (Baseβπ ) = (Baseβ(opprβπ ))) |
10 | 3, 9 | eleqtrd 2256 | . . 3 β’ (π β Ring β 1 β (Baseβ(opprβπ ))) |
11 | eqid 2177 | . . . 4 β’ (Baseβ(opprβπ )) = (Baseβ(opprβπ )) | |
12 | eqid 2177 | . . . 4 β’ (β₯rβ(opprβπ )) = (β₯rβ(opprβπ )) | |
13 | 11, 12 | dvdsrid 13267 | . . 3 β’ (((opprβπ ) β Ring β§ 1 β (Baseβ(opprβπ ))) β 1 (β₯rβ(opprβπ )) 1 ) |
14 | 8, 10, 13 | syl2anc 411 | . 2 β’ (π β Ring β 1 (β₯rβ(opprβπ )) 1 ) |
15 | unit.1 | . . . 4 β’ π = (Unitβπ ) | |
16 | 15 | a1i 9 | . . 3 β’ (π β Ring β π = (Unitβπ )) |
17 | 2 | a1i 9 | . . 3 β’ (π β Ring β 1 = (1rβπ )) |
18 | eqidd 2178 | . . 3 β’ (π β Ring β (β₯rβπ ) = (β₯rβπ )) | |
19 | eqidd 2178 | . . 3 β’ (π β Ring β (opprβπ ) = (opprβπ )) | |
20 | eqidd 2178 | . . 3 β’ (π β Ring β (β₯rβ(opprβπ )) = (β₯rβ(opprβπ ))) | |
21 | ringsrg 13222 | . . 3 β’ (π β Ring β π β SRing) | |
22 | 16, 17, 18, 19, 20, 21 | isunitd 13273 | . 2 β’ (π β Ring β ( 1 β π β ( 1 (β₯rβπ ) 1 β§ 1 (β₯rβ(opprβπ )) 1 ))) |
23 | 6, 14, 22 | mpbir2and 944 | 1 β’ (π β Ring β 1 β π) |
Colors of variables: wff set class |
Syntax hints: β wi 4 = wceq 1353 β wcel 2148 class class class wbr 4003 βcfv 5216 Basecbs 12461 1rcur 13140 Ringcrg 13177 opprcoppr 13237 β₯rcdsr 13253 Unitcui 13254 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 614 ax-in2 615 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-13 2150 ax-14 2151 ax-ext 2159 ax-coll 4118 ax-sep 4121 ax-nul 4129 ax-pow 4174 ax-pr 4209 ax-un 4433 ax-setind 4536 ax-cnex 7901 ax-resscn 7902 ax-1cn 7903 ax-1re 7904 ax-icn 7905 ax-addcl 7906 ax-addrcl 7907 ax-mulcl 7908 ax-addcom 7910 ax-addass 7912 ax-i2m1 7915 ax-0lt1 7916 ax-0id 7918 ax-rnegex 7919 ax-pre-ltirr 7922 ax-pre-lttrn 7924 ax-pre-ltadd 7926 |
This theorem depends on definitions: df-bi 117 df-3an 980 df-tru 1356 df-fal 1359 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ne 2348 df-nel 2443 df-ral 2460 df-rex 2461 df-reu 2462 df-rmo 2463 df-rab 2464 df-v 2739 df-sbc 2963 df-csb 3058 df-dif 3131 df-un 3133 df-in 3135 df-ss 3142 df-nul 3423 df-pw 3577 df-sn 3598 df-pr 3599 df-op 3601 df-uni 3810 df-int 3845 df-iun 3888 df-br 4004 df-opab 4065 df-mpt 4066 df-id 4293 df-xp 4632 df-rel 4633 df-cnv 4634 df-co 4635 df-dm 4636 df-rn 4637 df-res 4638 df-ima 4639 df-iota 5178 df-fun 5218 df-fn 5219 df-f 5220 df-f1 5221 df-fo 5222 df-f1o 5223 df-fv 5224 df-riota 5830 df-ov 5877 df-oprab 5878 df-mpo 5879 df-tpos 6245 df-pnf 7993 df-mnf 7994 df-ltxr 7996 df-inn 8919 df-2 8977 df-3 8978 df-ndx 12464 df-slot 12465 df-base 12467 df-sets 12468 df-plusg 12548 df-mulr 12549 df-0g 12706 df-mgm 12774 df-sgrp 12807 df-mnd 12817 df-grp 12879 df-minusg 12880 df-cmn 13088 df-abl 13089 df-mgp 13129 df-ur 13141 df-srg 13145 df-ring 13179 df-oppr 13238 df-dvdsr 13256 df-unit 13257 |
This theorem is referenced by: unitgrp 13283 unitgrpid 13285 unitsubm 13286 1rinv 13295 0unit 13296 dvr1 13305 subrgugrp 13359 |
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