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Mirrors > Home > MPE Home > Th. List > ge0nemnf | Structured version Visualization version GIF version |
Description: A nonnegative extended real is greater than negative infinity. (Contributed by Mario Carneiro, 20-Aug-2015.) |
Ref | Expression |
---|---|
ge0nemnf | ⊢ ((𝐴 ∈ ℝ* ∧ 0 ≤ 𝐴) → 𝐴 ≠ -∞) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ge0gtmnf 12888 | . 2 ⊢ ((𝐴 ∈ ℝ* ∧ 0 ≤ 𝐴) → -∞ < 𝐴) | |
2 | ngtmnft 12882 | . . . 4 ⊢ (𝐴 ∈ ℝ* → (𝐴 = -∞ ↔ ¬ -∞ < 𝐴)) | |
3 | 2 | adantr 480 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ 0 ≤ 𝐴) → (𝐴 = -∞ ↔ ¬ -∞ < 𝐴)) |
4 | 3 | necon2abid 2987 | . 2 ⊢ ((𝐴 ∈ ℝ* ∧ 0 ≤ 𝐴) → (-∞ < 𝐴 ↔ 𝐴 ≠ -∞)) |
5 | 1, 4 | mpbid 231 | 1 ⊢ ((𝐴 ∈ ℝ* ∧ 0 ≤ 𝐴) → 𝐴 ≠ -∞) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 395 = wceq 1541 ∈ wcel 2109 ≠ wne 2944 class class class wbr 5078 0cc0 10855 -∞cmnf 10991 ℝ*cxr 10992 < clt 10993 ≤ cle 10994 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1801 ax-4 1815 ax-5 1916 ax-6 1974 ax-7 2014 ax-8 2111 ax-9 2119 ax-10 2140 ax-11 2157 ax-12 2174 ax-ext 2710 ax-sep 5226 ax-nul 5233 ax-pow 5291 ax-pr 5355 ax-un 7579 ax-cnex 10911 ax-resscn 10912 ax-1cn 10913 ax-addrcl 10916 ax-rnegex 10926 ax-cnre 10928 ax-pre-lttri 10929 ax-pre-lttrn 10930 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1544 df-fal 1554 df-ex 1786 df-nf 1790 df-sb 2071 df-mo 2541 df-eu 2570 df-clab 2717 df-cleq 2731 df-clel 2817 df-nfc 2890 df-ne 2945 df-nel 3051 df-ral 3070 df-rex 3071 df-rab 3074 df-v 3432 df-sbc 3720 df-csb 3837 df-dif 3894 df-un 3896 df-in 3898 df-ss 3908 df-nul 4262 df-if 4465 df-pw 4540 df-sn 4567 df-pr 4569 df-op 4573 df-uni 4845 df-br 5079 df-opab 5141 df-mpt 5162 df-id 5488 df-po 5502 df-so 5503 df-xp 5594 df-rel 5595 df-cnv 5596 df-co 5597 df-dm 5598 df-rn 5599 df-res 5600 df-ima 5601 df-iota 6388 df-fun 6432 df-fn 6433 df-f 6434 df-f1 6435 df-fo 6436 df-f1o 6437 df-fv 6438 df-er 8472 df-en 8708 df-dom 8709 df-sdom 8710 df-pnf 10995 df-mnf 10996 df-xr 10997 df-ltxr 10998 df-le 10999 |
This theorem is referenced by: xlesubadd 12979 xadddi2 13013 xrge0neqmnf 13166 xrge0subm 20620 isxmet2d 23461 xmetrtri 23489 imasdsf1olem 23507 xblpnfps 23529 xblpnf 23530 xblss2ps 23535 xblss2 23536 nmoix 23874 nmoleub 23876 blcvx 23942 xrge0gsumle 23977 xrge0tsms 23978 metdstri 23995 metdscnlem 23999 nmoleub2lem 24258 xrge0addass 31278 xrge0tsmsd 31296 |
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