Theorem lt0ne0d 8831

Description: Something less than zero is not zero. Deduction form. See also lt0ap0d 8967 which is similar but for apartness. (Contributed by David Moews, 28-Feb-2017.)

Hypothesis

Ref	Expression
lt0ne0d.1	⊢ (𝜑 → 𝐴 < 0)

Assertion

Ref	Expression
lt0ne0d	⊢ (𝜑 → 𝐴 ≠ 0)

Proof of Theorem lt0ne0d

Step	Hyp	Ref	Expression
1		lt0ne0d.1	. 2 ⊢ (𝜑 → 𝐴 < 0)
2		0re 8316	. . . . 5 ⊢ 0 ∈ ℝ
3	2	ltnri 8408	. . . 4 ⊢ ¬ 0 < 0
4		breq1 4128	. . . 4 ⊢ (𝐴 = 0 → (𝐴 < 0 ↔ 0 < 0))
5	3, 4	mtbiri 686	. . 3 ⊢ (𝐴 = 0 → ¬ 𝐴 < 0)
6	5	necon2ai 2474	. 2 ⊢ (𝐴 < 0 → 𝐴 ≠ 0)
7	1, 6	syl 14	1 ⊢ (𝜑 → 𝐴 ≠ 0)

Syntax hints:   → wi 4   = wceq 1402   ≠ wne 2420   class class class wbr 4125  0cc0 8169   < clt 8350

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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341  ax-un 4573  ax-setind 4679  ax-cnex 8260  ax-resscn 8261  ax-1re 8263  ax-addrcl 8266  ax-rnegex 8278  ax-pre-ltirr 8281

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-br 4126  df-opab 4188  df-xp 4775  df-pnf 8352  df-mnf 8353  df-ltxr 8355

This theorem is referenced by:  divalglemeuneg  12668