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Mirrors > Home > ILE Home > Th. List > cleqh | Unicode version |
Description: Establish equality between classes, using bound-variable hypotheses instead of distinct variable conditions. See also cleqf 2361. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
cleqh.1 |
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cleqh.2 |
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Ref | Expression |
---|---|
cleqh |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfcleq 2187 |
. 2
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2 | ax-17 1537 |
. . . 4
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3 | dfbi2 388 |
. . . . 5
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4 | cleqh.1 |
. . . . . . 7
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5 | cleqh.2 |
. . . . . . 7
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6 | 4, 5 | hbim 1556 |
. . . . . 6
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7 | 5, 4 | hbim 1556 |
. . . . . 6
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8 | 6, 7 | hban 1558 |
. . . . 5
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9 | 3, 8 | hbxfrbi 1483 |
. . . 4
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10 | eleq1 2256 |
. . . . . 6
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11 | eleq1 2256 |
. . . . . 6
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12 | 10, 11 | bibi12d 235 |
. . . . 5
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13 | 12 | biimpd 144 |
. . . 4
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14 | 2, 9, 13 | cbv3h 1754 |
. . 3
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15 | 12 | equcoms 1719 |
. . . . 5
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16 | 15 | biimprd 158 |
. . . 4
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17 | 9, 2, 16 | cbv3h 1754 |
. . 3
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18 | 14, 17 | impbii 126 |
. 2
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19 | 1, 18 | bitr4i 187 |
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-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-ext 2175 |
This theorem depends on definitions: df-bi 117 df-nf 1472 df-cleq 2186 df-clel 2189 |
This theorem is referenced by: abeq2 2302 |
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