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Mirrors > Home > ILE Home > Th. List > dcdifsnid | Unicode version |
Description: If we remove a single element from a set with decidable equality then put it back in, we end up with the original set. This strengthens difsnss 3740 from subset to equality but the proof relies on equality being decidable. (Contributed by Jim Kingdon, 17-Jun-2022.) |
Ref | Expression |
---|---|
dcdifsnid |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | difsnss 3740 |
. . 3
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2 | 1 | adantl 277 |
. 2
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3 | simpr 110 |
. . . . . . 7
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4 | velsn 3611 |
. . . . . . 7
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5 | 3, 4 | sylibr 134 |
. . . . . 6
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6 | elun2 3305 |
. . . . . 6
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7 | 5, 6 | syl 14 |
. . . . 5
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8 | simplr 528 |
. . . . . . 7
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9 | simpr 110 |
. . . . . . . 8
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10 | 9, 4 | sylnibr 677 |
. . . . . . 7
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11 | 8, 10 | eldifd 3141 |
. . . . . 6
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12 | elun1 3304 |
. . . . . 6
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13 | 11, 12 | syl 14 |
. . . . 5
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14 | simpll 527 |
. . . . . . 7
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15 | simpr 110 |
. . . . . . . 8
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16 | simplr 528 |
. . . . . . . 8
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17 | equequ1 1712 |
. . . . . . . . . 10
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18 | 17 | dcbid 838 |
. . . . . . . . 9
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19 | eqeq2 2187 |
. . . . . . . . . 10
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20 | 19 | dcbid 838 |
. . . . . . . . 9
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21 | 18, 20 | rspc2v 2856 |
. . . . . . . 8
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22 | 15, 16, 21 | syl2anc 411 |
. . . . . . 7
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23 | 14, 22 | mpd 13 |
. . . . . 6
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24 | exmiddc 836 |
. . . . . 6
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25 | 23, 24 | syl 14 |
. . . . 5
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26 | 7, 13, 25 | mpjaodan 798 |
. . . 4
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27 | 26 | ex 115 |
. . 3
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28 | 27 | ssrdv 3163 |
. 2
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29 | 2, 28 | eqssd 3174 |
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-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-ext 2159 |
This theorem depends on definitions: df-bi 117 df-dc 835 df-tru 1356 df-nf 1461 df-sb 1763 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ral 2460 df-v 2741 df-dif 3133 df-un 3135 df-in 3137 df-ss 3144 df-sn 3600 |
This theorem is referenced by: fnsnsplitdc 6509 nndifsnid 6511 fidifsnid 6874 undifdc 6926 |
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