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Theorem lspsnsubn0 21095
Description: Unequal singleton spans imply nonzero vector subtraction. (Contributed by NM, 19-Mar-2015.)
Hypotheses
Ref Expression
lspsnsubn0.v 𝑉 = (Base‘𝑊)
lspsnsubn0.o 0 = (0g𝑊)
lspsnsubn0.m = (-g𝑊)
lspsnsubn0.w (𝜑𝑊 ∈ LMod)
lspsnsubn0.x (𝜑𝑋𝑉)
lspsnsubn0.y (𝜑𝑌𝑉)
lspsnsubn0.e (𝜑 → (𝑁‘{𝑋}) ≠ (𝑁‘{𝑌}))
Assertion
Ref Expression
lspsnsubn0 (𝜑 → (𝑋 𝑌) ≠ 0 )

Proof of Theorem lspsnsubn0
StepHypRef Expression
1 lspsnsubn0.e . 2 (𝜑 → (𝑁‘{𝑋}) ≠ (𝑁‘{𝑌}))
2 lspsnsubn0.w . . . . 5 (𝜑𝑊 ∈ LMod)
3 lspsnsubn0.x . . . . 5 (𝜑𝑋𝑉)
4 lspsnsubn0.y . . . . 5 (𝜑𝑌𝑉)
5 lspsnsubn0.v . . . . . 6 𝑉 = (Base‘𝑊)
6 lspsnsubn0.o . . . . . 6 0 = (0g𝑊)
7 lspsnsubn0.m . . . . . 6 = (-g𝑊)
85, 6, 7lmodsubeq0 20872 . . . . 5 ((𝑊 ∈ LMod ∧ 𝑋𝑉𝑌𝑉) → ((𝑋 𝑌) = 0𝑋 = 𝑌))
92, 3, 4, 8syl3anc 1373 . . . 4 (𝜑 → ((𝑋 𝑌) = 0𝑋 = 𝑌))
10 sneq 4590 . . . . 5 (𝑋 = 𝑌 → {𝑋} = {𝑌})
1110fveq2d 6838 . . . 4 (𝑋 = 𝑌 → (𝑁‘{𝑋}) = (𝑁‘{𝑌}))
129, 11biimtrdi 253 . . 3 (𝜑 → ((𝑋 𝑌) = 0 → (𝑁‘{𝑋}) = (𝑁‘{𝑌})))
1312necon3d 2953 . 2 (𝜑 → ((𝑁‘{𝑋}) ≠ (𝑁‘{𝑌}) → (𝑋 𝑌) ≠ 0 ))
141, 13mpd 15 1 (𝜑 → (𝑋 𝑌) ≠ 0 )
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206   = wceq 1541  wcel 2113  wne 2932  {csn 4580  cfv 6492  (class class class)co 7358  Basecbs 17136  0gc0g 17359  -gcsg 18865  LModclmod 20811
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-10 2146  ax-11 2162  ax-12 2184  ax-ext 2708  ax-sep 5241  ax-nul 5251  ax-pow 5310  ax-pr 5377  ax-un 7680
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-ral 3052  df-rex 3061  df-rmo 3350  df-reu 3351  df-rab 3400  df-v 3442  df-sbc 3741  df-csb 3850  df-dif 3904  df-un 3906  df-in 3908  df-ss 3918  df-nul 4286  df-if 4480  df-pw 4556  df-sn 4581  df-pr 4583  df-op 4587  df-uni 4864  df-iun 4948  df-br 5099  df-opab 5161  df-mpt 5180  df-id 5519  df-xp 5630  df-rel 5631  df-cnv 5632  df-co 5633  df-dm 5634  df-rn 5635  df-res 5636  df-ima 5637  df-iota 6448  df-fun 6494  df-fn 6495  df-f 6496  df-fv 6500  df-riota 7315  df-ov 7361  df-oprab 7362  df-mpo 7363  df-1st 7933  df-2nd 7934  df-0g 17361  df-mgm 18565  df-sgrp 18644  df-mnd 18660  df-grp 18866  df-minusg 18867  df-sbg 18868  df-lmod 20813
This theorem is referenced by:  mapdpglem4N  41932
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