Theorem addneintrd 8477

Description: Introducing a term on the left-hand side of a sum in a negated equality. Contrapositive of addcanad 8475. Consequence of addcand 8473. (Contributed by David Moews, 28-Feb-2017.)

Hypotheses

Ref	Expression
addcand.1	|- ( ph -> A e. CC )
addcand.2	|- ( ph -> B e. CC )
addcand.3	|- ( ph -> C e. CC )
addneintrd.4	|- ( ph -> B =/= C )

Assertion

Ref	Expression
addneintrd	|- ( ph -> ( A + B ) =/= ( A + C ) )

Proof of Theorem addneintrd

Step	Hyp	Ref	Expression
1		addneintrd.4	. 2 |- ( ph -> B =/= C )
2		addcand.1	. . . 4 |- ( ph -> A e. CC )
3		addcand.2	. . . 4 |- ( ph -> B e. CC )
4		addcand.3	. . . 4 |- ( ph -> C e. CC )
5	2, 3, 4	addcand 8473	. . 3 |- ( ph -> ( ( A + B ) = ( A + C ) <-> B = C ) )
6	5	necon3bid 2455	. 2 |- ( ph -> ( ( A + B ) =/= ( A + C ) <-> B =/= C ) )
7	1, 6	mpbird 167	1 |- ( ph -> ( A + B ) =/= ( A + C ) )

Syntax hints:   -> wi 4   e. wcel 2205   =/= wne 2414  (class class class)co 6058   CCcc 8141   + caddc 8146

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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2216  ax-resscn 8235  ax-1cn 8236  ax-icn 8238  ax-addcl 8239  ax-addrcl 8240  ax-mulcl 8241  ax-addcom 8243  ax-addass 8245  ax-distr 8247  ax-i2m1 8248  ax-0id 8251  ax-rnegex 8252  ax-cnre 8254

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-ral 2527  df-rex 2528  df-v 2817  df-un 3218  df-in 3220  df-ss 3227  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-br 4115  df-iota 5317  df-fv 5365  df-ov 6061

This theorem is referenced by: (None)