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Theorem negne0d 8335
Description: The negative of a nonzero number is nonzero. See also negap0d 8658 which is similar but for apart from zero rather than not equal to zero. (Contributed by Mario Carneiro, 27-May-2016.)
Hypotheses
Ref Expression
negidd.1  |-  ( ph  ->  A  e.  CC )
negne0d.2  |-  ( ph  ->  A  =/=  0 )
Assertion
Ref Expression
negne0d  |-  ( ph  -> 
-u A  =/=  0
)

Proof of Theorem negne0d
StepHypRef Expression
1 negne0d.2 . 2  |-  ( ph  ->  A  =/=  0 )
2 negidd.1 . . 3  |-  ( ph  ->  A  e.  CC )
32negne0bd 8330 . 2  |-  ( ph  ->  ( A  =/=  0  <->  -u A  =/=  0 ) )
41, 3mpbid 147 1  |-  ( ph  -> 
-u A  =/=  0
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    e. wcel 2167    =/= wne 2367   CCcc 7877   0cc0 7879   -ucneg 8198
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 615  ax-in2 616  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-14 2170  ax-ext 2178  ax-sep 4151  ax-pow 4207  ax-pr 4242  ax-setind 4573  ax-resscn 7971  ax-1cn 7972  ax-icn 7974  ax-addcl 7975  ax-addrcl 7976  ax-mulcl 7977  ax-addcom 7979  ax-addass 7981  ax-distr 7983  ax-i2m1 7984  ax-0id 7987  ax-rnegex 7988  ax-cnre 7990
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-fal 1370  df-nf 1475  df-sb 1777  df-eu 2048  df-mo 2049  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ne 2368  df-ral 2480  df-rex 2481  df-reu 2482  df-rab 2484  df-v 2765  df-sbc 2990  df-dif 3159  df-un 3161  df-in 3163  df-ss 3170  df-pw 3607  df-sn 3628  df-pr 3629  df-op 3631  df-uni 3840  df-br 4034  df-opab 4095  df-id 4328  df-xp 4669  df-rel 4670  df-cnv 4671  df-co 4672  df-dm 4673  df-iota 5219  df-fun 5260  df-fv 5266  df-riota 5877  df-ov 5925  df-oprab 5926  df-mpo 5927  df-sub 8199  df-neg 8200
This theorem is referenced by:  lgsneg  15265
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