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Mirrors > Home > NFE Home > Th. List > 2eu7 | Unicode version |
Description: Two equivalent expressions for double existential uniqueness. (Contributed by NM, 19-Feb-2005.) |
Ref | Expression |
---|---|
2eu7 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfe1 1732 |
. . . 4
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2 | 1 | nfeu 2220 |
. . 3
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3 | 2 | euan 2261 |
. 2
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4 | ancom 437 |
. . . . 5
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5 | 4 | eubii 2213 |
. . . 4
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6 | nfe1 1732 |
. . . . 5
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7 | 6 | euan 2261 |
. . . 4
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8 | ancom 437 |
. . . 4
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9 | 5, 7, 8 | 3bitri 262 |
. . 3
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10 | 9 | eubii 2213 |
. 2
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11 | ancom 437 |
. 2
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12 | 3, 10, 11 | 3bitr4ri 269 |
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 |
This theorem depends on definitions: df-bi 177 df-or 359 df-an 360 df-tru 1319 df-ex 1542 df-nf 1545 df-sb 1649 df-eu 2208 df-mo 2209 |
This theorem is referenced by: 2eu8 2291 |
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