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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 10202 ge0gtmnf 10235 xlt0neg1 10250 xlt0neg2 10251 xle0neg1 10252 xle0neg2 10253 xaddf 10256 xaddval 10257 xaddid1 10274 xaddid2 10275 xnn0xadd0 10279 xaddge0 10290 xsubge0 10293 xposdif 10294 ioopos 10362 elxrge0 10390 0e0iccpnf 10392 dfrp2 10708 xrmaxadd 12043 xrminrpcl 12056 xrbdtri 12058 fprodge0 12420 ef01bndlem 12539 sin01bnd 12540 cos01bnd 12541 cos1bnd 12542 sinltxirr 12544 sin01gt0 12545 cos01gt0 12546 sin02gt0 12547 sincos1sgn 12548 sincos2sgn 12549 cos12dec 12551 halfleoddlt 12677 psmetge0 15481 isxmet2d 15498 xmetge0 15515 blgt0 15552 xblss2ps 15554 xblss2 15555 xblm 15567 bdxmet 15651 bdmet 15652 bdmopn 15654 xmetxp 15657 cnblcld 15685 blssioo 15703 reeff1oleme 15922 reeff1o 15923 sin0pilem1 15932 sin0pilem2 15933 pilem3 15934 sinhalfpilem 15942 sincosq1lem 15976 sincosq1sgn 15977 sincosq2sgn 15978 sinq12gt0 15981 cosq14gt0 15983 tangtx 15989 sincos4thpi 15991 pigt3 15995 cosordlem 16000 cosq34lt1 16001 cos02pilt1 16002 cos0pilt1 16003 repiecelem 17172 repiecege0 17174 iooref1o 17181 taupi 17221 |
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