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Mirrors > Home > ILE Home > Th. List > eueq | Unicode version |
Description: Equality has existential uniqueness. (Contributed by NM, 25-Nov-1994.) |
Ref | Expression |
---|---|
eueq |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqtr3 2132 |
. . . 4
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2 | 1 | gen2 1407 |
. . 3
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3 | 2 | biantru 298 |
. 2
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4 | isset 2661 |
. 2
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5 | eqeq1 2119 |
. . 3
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6 | 5 | eu4 2035 |
. 2
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7 | 3, 4, 6 | 3bitr4i 211 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 681 ax-5 1404 ax-7 1405 ax-gen 1406 ax-ie1 1450 ax-ie2 1451 ax-8 1463 ax-10 1464 ax-11 1465 ax-i12 1466 ax-bndl 1467 ax-4 1468 ax-17 1487 ax-i9 1491 ax-ial 1495 ax-i5r 1496 ax-ext 2095 |
This theorem depends on definitions: df-bi 116 df-nf 1418 df-sb 1717 df-eu 1976 df-mo 1977 df-clab 2100 df-cleq 2106 df-clel 2109 df-v 2657 |
This theorem is referenced by: eueq1 2823 moeq 2826 mosubt 2828 reuhypd 4350 mptfng 5204 upxp 12277 |
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