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Mirrors > Home > ILE Home > Th. List > ersym | Unicode version |
Description: An equivalence relation is symmetric. (Contributed by NM, 4-Jun-1995.) (Revised by Mario Carneiro, 12-Aug-2015.) |
Ref | Expression |
---|---|
ersym.1 |
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ersym.2 |
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Ref | Expression |
---|---|
ersym |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ersym.2 |
. . 3
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2 | ersym.1 |
. . . . . 6
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3 | errel 6558 |
. . . . . 6
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4 | 2, 3 | syl 14 |
. . . . 5
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5 | brrelex12 4676 |
. . . . 5
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6 | 4, 1, 5 | syl2anc 411 |
. . . 4
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7 | brcnvg 4820 |
. . . . 5
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8 | 7 | ancoms 268 |
. . . 4
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9 | 6, 8 | syl 14 |
. . 3
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10 | 1, 9 | mpbird 167 |
. 2
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11 | df-er 6549 |
. . . . . 6
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12 | 11 | simp3bi 1015 |
. . . . 5
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13 | 2, 12 | syl 14 |
. . . 4
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14 | 13 | unssad 3324 |
. . 3
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15 | 14 | ssbrd 4058 |
. 2
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16 | 10, 15 | mpd 13 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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-io 710 ax-5 1457 ax-7 1458 ax-gen 1459 ax-ie1 1503 ax-ie2 1504 ax-8 1514 ax-10 1515 ax-11 1516 ax-i12 1517 ax-bndl 1519 ax-4 1520 ax-17 1536 ax-i9 1540 ax-ial 1544 ax-i5r 1545 ax-14 2161 ax-ext 2169 ax-sep 4133 ax-pow 4186 ax-pr 4221 |
This theorem depends on definitions: df-bi 117 df-3an 981 df-tru 1366 df-nf 1471 df-sb 1773 df-eu 2039 df-mo 2040 df-clab 2174 df-cleq 2180 df-clel 2183 df-nfc 2318 df-ral 2470 df-rex 2471 df-v 2751 df-un 3145 df-in 3147 df-ss 3154 df-pw 3589 df-sn 3610 df-pr 3611 df-op 3613 df-br 4016 df-opab 4077 df-xp 4644 df-rel 4645 df-cnv 4646 df-er 6549 |
This theorem is referenced by: ercl2 6562 ersymb 6563 ertr2d 6566 ertr3d 6567 ertr4d 6568 erth 6593 erinxp 6623 qusgrp2 13016 2idlcpblrng 13768 |
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