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Related theorems GIF version |
| Description: Plus infinity belongs to the set of extended reals. |
| Ref | Expression |
|---|---|
| pnfxr | ⊢ +∞ ∈ ℝ* |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-pnf 5459 | . . . . . 6 ⊢ +∞ = ℘∪ℂ | |
| 2 | axcnex 5239 | . . . . . . . 8 ⊢ ℂ ∈ V | |
| 3 | 2 | uniex 2861 | . . . . . . 7 ⊢ ∪ℂ ∈ V |
| 4 | 3 | pwex 2735 | . . . . . 6 ⊢ ℘∪ℂ ∈ V |
| 5 | 1, 4 | eqeltr 1536 | . . . . 5 ⊢ +∞ ∈ V |
| 6 | 5 | pri1 2441 | . . . 4 ⊢ +∞ ∈ { +∞, -∞} |
| 7 | 6 | olci 271 | . . 3 ⊢ ( +∞ ∈ ℝ ⋁ +∞ ∈ { +∞, -∞}) |
| 8 | elun 2163 | . . 3 ⊢ ( +∞ ∈ (ℝ ∪ { +∞, -∞}) ↔ ( +∞ ∈ ℝ ⋁ +∞ ∈ { +∞, -∞})) | |
| 9 | 7, 8 | mpbir 190 | . 2 ⊢ +∞ ∈ (ℝ ∪ { +∞, -∞}) |
| 10 | df-xr 5461 | . 2 ⊢ ℝ* = (ℝ ∪ { +∞, -∞}) | |
| 11 | 9, 10 | eleqtrr 1539 | 1 ⊢ +∞ ∈ ℝ* |
| Colors of variables: wff set class |
| Syntax hints: ⋁ wo 222 ∈ wcel 955 Vcvv 1802 ∪ cun 2035 ℘cpw 2391 {cpr 2400 ∪cuni 2493 ℂcc 5204 ℝcr 5205 +∞cpnf 5455 -∞cmnf 5456 ℝ*cxr 5457 |
| This theorem is referenced by: ltxrt 5467 elxr 5508 ssxr 5513 xrltnrt 5514 ltpnft 5515 mnfltpnf 5517 pnfnltt 5519 pnfget 5521 nltpnftt 5539 xrret 5542 xrre2t 5543 xrsupsslem 6023 xrinfmsslem 6024 xrinfmss 6026 supxrpnf 6035 supxrunb1 6036 supxrunb2 6037 supxrbnd 6038 qbtwnxr 6217 elioc2t 6322 elico2t 6323 elicc2t 6324 ioomax 6325 ioopos 6326 ioossre 6328 unirnioo 6335 tgioolem 7853 isblo3i 8392 cdrci 10381 truni1 10386 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 959 ax-gen 960 ax-8 961 ax-9 962 ax-10 963 ax-11 964 ax-12 965 ax-13 966 ax-14 967 ax-17 968 ax-4 970 ax-5o 972 ax-6o 975 ax-9o 1119 ax-10o 1136 ax-16 1206 ax-11o 1213 ax-ext 1452 ax-rep 2683 ax-sep 2693 ax-nul 2700 ax-pow 2732 ax-pr 2769 ax-un 2857 ax-inf2 4597 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3or 774 df-3an 775 df-ex 978 df-sb 1168 df-eu 1375 df-mo 1376 df-clab 1457 df-cleq 1462 df-clel 1465 df-ne 1579 df-ral 1641 df-rex 1642 df-v 1803 df-dif 2039 df-un 2040 df-in 2041 df-ss 2043 df-pss 2045 df-nul 2271 df-if 2352 df-pw 2392 df-sn 2402 df-pr 2403 df-tp 2405 df-op 2406 df-uni 2494 df-br 2610 df-opab 2657 df-tr 2671 df-eprel 2821 df-id 2824 df-po 2831 df-so 2841 df-fr 2907 df-we 2924 df-ord 2941 df-on 2942 df-lim 2943 df-suc 2944 df-om 3122 df-xp 3174 df-rel 3175 df-cnv 3176 df-co 3177 df-dm 3178 df-rn 3179 df-res 3180 df-ima 3181 df-fun 3182 df-fn 3183 df-qs 4250 df-ni 4972 df-nq 5010 df-np 5058 df-nr 5139 df-c 5212 df-pnf 5459 df-xr 5461 |