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Mirrors > Home > NFE Home > Th. List > uneqin | Unicode version |
Description: Equality of union and intersection implies equality of their arguments. (Contributed by NM, 16-Apr-2006.) (Proof shortened by Andrew Salmon, 26-Jun-2011.) |
Ref | Expression |
---|---|
uneqin |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqimss 3324 |
. . . 4
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2 | unss 3438 |
. . . . 5
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3 | ssin 3478 |
. . . . . . 7
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4 | sstr 3281 |
. . . . . . 7
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5 | 3, 4 | sylbir 204 |
. . . . . 6
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6 | ssin 3478 |
. . . . . . 7
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7 | simpl 443 |
. . . . . . 7
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8 | 6, 7 | sylbir 204 |
. . . . . 6
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9 | 5, 8 | anim12i 549 |
. . . . 5
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10 | 2, 9 | sylbir 204 |
. . . 4
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11 | 1, 10 | syl 15 |
. . 3
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12 | eqss 3288 |
. . 3
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13 | 11, 12 | sylibr 203 |
. 2
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14 | unidm 3408 |
. . . 4
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15 | inidm 3465 |
. . . 4
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16 | 14, 15 | eqtr4i 2376 |
. . 3
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17 | uneq2 3413 |
. . 3
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18 | ineq2 3452 |
. . 3
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19 | 16, 17, 18 | 3eqtr3a 2409 |
. 2
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20 | 13, 19 | impbii 180 |
1
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Colors of variables: wff setvar class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1546 ax-5 1557 ax-17 1616 ax-9 1654 ax-8 1675 ax-6 1729 ax-7 1734 ax-11 1746 ax-12 1925 ax-ext 2334 |
This theorem depends on definitions: df-bi 177 df-or 359 df-an 360 df-nan 1288 df-tru 1319 df-ex 1542 df-nf 1545 df-sb 1649 df-clab 2340 df-cleq 2346 df-clel 2349 df-nfc 2479 df-v 2862 df-nin 3212 df-compl 3213 df-in 3214 df-un 3215 df-ss 3260 |
This theorem is referenced by: uniintsn 3964 |
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