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Mirrors > Home > ILE Home > Th. List > sbcco2 | Unicode version |
Description: A composition law for
class substitution. Importantly, ![]() ![]() |
Ref | Expression |
---|---|
sbcco2.1 |
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
Ref | Expression |
---|---|
sbcco2 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sbsbc 2917 |
. 2
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2 | nfv 1509 |
. . 3
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3 | sbcco2.1 |
. . . . 5
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4 | 3 | equcoms 1685 |
. . . 4
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5 | dfsbcq 2915 |
. . . . 5
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6 | 5 | bicomd 140 |
. . . 4
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7 | 4, 6 | syl 14 |
. . 3
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8 | 2, 7 | sbie 1765 |
. 2
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9 | 1, 8 | bitr3i 185 |
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 105 ax-ia2 106 ax-ia3 107 ax-5 1424 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-4 1488 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-ext 2122 |
This theorem depends on definitions: df-bi 116 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-sbc 2914 |
This theorem is referenced by: (None) |
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