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Theorem nssne2 2996
Description: Two classes are different if they are not subclasses of the same class. (Contributed by NM, 23-Apr-2015.)
Assertion
Ref Expression
nssne2  C_  C  C_  C  =/=

Proof of Theorem nssne2
StepHypRef Expression
1 sseq1 2960 . . . 4  C_  C  C_  C
21biimpcd 148 . . 3 
C_  C 
C_  C
32necon3bd 2242 . 2 
C_  C  C_  C  =/=
43imp 115 1  C_  C  C_  C  =/=
Colors of variables: wff set class
Syntax hints:   wn 3   wi 4   wa 97   wceq 1242    =/= wne 2201    C_ wss 2911
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-in1 544  ax-in2 545  ax-5 1333  ax-7 1334  ax-gen 1335  ax-ie1 1379  ax-ie2 1380  ax-8 1392  ax-11 1394  ax-4 1397  ax-17 1416  ax-i9 1420  ax-ial 1424  ax-i5r 1425  ax-ext 2019
This theorem depends on definitions:  df-bi 110  df-nf 1347  df-sb 1643  df-clab 2024  df-cleq 2030  df-clel 2033  df-ne 2203  df-in 2918  df-ss 2925
This theorem is referenced by: (None)
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