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Mathbox for Richard Penner |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > dfss6 | Structured version Visualization version Unicode version |
Description: Another definition of subclasshood. (Contributed by RP, 16-Apr-2020.) |
Ref | Expression |
---|---|
dfss6 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfss2 3423 |
. . 3
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2 | notnot 293 |
. . 3
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3 | 1, 2 | bitri 253 |
. 2
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4 | exanali 1723 |
. 2
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5 | 3, 4 | xchbinxr 313 |
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 1671 ax-4 1684 ax-5 1760 ax-6 1807 ax-7 1853 ax-10 1917 ax-11 1922 ax-12 1935 ax-13 2093 ax-ext 2433 |
This theorem depends on definitions: df-bi 189 df-an 373 df-tru 1449 df-ex 1666 df-nf 1670 df-sb 1800 df-clab 2440 df-cleq 2446 df-clel 2449 df-in 3413 df-ss 3420 |
This theorem is referenced by: (None) |
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