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Mirrors > Home > ILE Home > Th. List > dfpss2 | Unicode version |
Description: Alternate definition of proper subclass. (Contributed by NM, 7-Feb-1996.) |
Ref | Expression |
---|---|
dfpss2 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-pss 2927 |
. 2
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2 | df-ne 2203 |
. . 3
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3 | 2 | anbi2i 430 |
. 2
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4 | 1, 3 | bitri 173 |
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 99 ax-ia2 100 ax-ia3 101 |
This theorem depends on definitions: df-bi 110 df-ne 2203 df-pss 2927 |
This theorem is referenced by: dfpss3 3024 psstr 3043 sspsstr 3044 psssstr 3045 pssv 3261 disj4im 3270 ssnelpss 3283 onpsssuc 4247 f1imapss 5358 |
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