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Mirrors > Home > NFE Home > Th. List > pssssd | Unicode version |
Description: Deduce subclass from proper subclass. (Contributed by NM, 29-Feb-1996.) |
Ref | Expression |
---|---|
pssssd.1 |
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Ref | Expression |
---|---|
pssssd |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pssssd.1 |
. 2
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2 | pssss 3365 |
. 2
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3 | 1, 2 | syl 15 |
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 |
This theorem depends on definitions: df-bi 177 df-an 360 df-pss 3262 |
This theorem is referenced by: sfinltfin 4536 |
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