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| Mirrors > Home > ILE Home > Th. List > 0xr | Unicode version | ||
| Description: Zero is an extended real. (Contributed by Mario Carneiro, 15-Jun-2014.) |
| Ref | Expression |
|---|---|
| 0xr |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ressxr 8369 |
. 2
| |
| 2 | 0re 8326 |
. 2
| |
| 3 | 1, 2 | sselii 3245 |
1
|
| Colors of variables: wff set class |
| This proof depends on syntax axioms:
|
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 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-ext 2220 ax-1re 8273 ax-addrcl 8276 ax-rnegex 8288 |
| This proof depends on definitions: df-bi 117 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-xr 8364 |
| This theorem is used by: 0lepnf 10192 ge0gtmnf 10225 xlt0neg1 10240 xlt0neg2 10241 xle0neg1 10242 xle0neg2 10243 xaddf 10246 xaddval 10247 xaddid1 10264 xaddid2 10265 xnn0xadd0 10269 xaddge0 10280 xsubge0 10283 xposdif 10284 ioopos 10352 elxrge0 10380 0e0iccpnf 10382 dfrp2 10698 xrmaxadd 12027 xrminrpcl 12040 xrbdtri 12042 fprodge0 12404 ef01bndlem 12523 sin01bnd 12524 cos01bnd 12525 cos1bnd 12526 sinltxirr 12528 sin01gt0 12529 cos01gt0 12530 sin02gt0 12531 sincos1sgn 12532 sincos2sgn 12533 cos12dec 12535 halfleoddlt 12661 psmetge0 15432 isxmet2d 15449 xmetge0 15466 blgt0 15503 xblss2ps 15505 xblss2 15506 xblm 15518 bdxmet 15602 bdmet 15603 bdmopn 15605 xmetxp 15608 cnblcld 15636 blssioo 15654 reeff1oleme 15873 reeff1o 15874 sin0pilem1 15882 sin0pilem2 15883 pilem3 15884 sinhalfpilem 15892 sincosq1lem 15926 sincosq1sgn 15927 sincosq2sgn 15928 sinq12gt0 15931 cosq14gt0 15933 tangtx 15939 sincos4thpi 15941 pigt3 15945 cosordlem 15950 cosq34lt1 15951 cos02pilt1 15952 cos0pilt1 15953 repiecelem 17074 repiecege0 17076 iooref1o 17083 taupi 17123 |
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