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Mirrors > Home > NFE Home > Th. List > pssne | Unicode version |
Description: Two classes in a proper subclass relationship are not equal. (Contributed by NM, 16-Feb-2015.) |
Ref | Expression |
---|---|
pssne |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-pss 3262 |
. 2
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2 | 1 | simprbi 450 |
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: pssned 3368 |
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