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Mirrors > Home > ILE Home > Th. List > 0re | GIF version |
Description: 0 is a real number. (Contributed by Eric Schmidt, 21-May-2007.) (Revised by Scott Fenton, 3-Jan-2013.) |
Ref | Expression |
---|---|
0re | ⊢ 0 ∈ ℝ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1re 7765 | . 2 ⊢ 1 ∈ ℝ | |
2 | ax-rnegex 7729 | . 2 ⊢ (1 ∈ ℝ → ∃𝑥 ∈ ℝ (1 + 𝑥) = 0) | |
3 | readdcl 7746 | . . . . 5 ⊢ ((1 ∈ ℝ ∧ 𝑥 ∈ ℝ) → (1 + 𝑥) ∈ ℝ) | |
4 | 1, 3 | mpan 420 | . . . 4 ⊢ (𝑥 ∈ ℝ → (1 + 𝑥) ∈ ℝ) |
5 | eleq1 2202 | . . . 4 ⊢ ((1 + 𝑥) = 0 → ((1 + 𝑥) ∈ ℝ ↔ 0 ∈ ℝ)) | |
6 | 4, 5 | syl5ibcom 154 | . . 3 ⊢ (𝑥 ∈ ℝ → ((1 + 𝑥) = 0 → 0 ∈ ℝ)) |
7 | 6 | rexlimiv 2543 | . 2 ⊢ (∃𝑥 ∈ ℝ (1 + 𝑥) = 0 → 0 ∈ ℝ) |
8 | 1, 2, 7 | mp2b 8 | 1 ⊢ 0 ∈ ℝ |
Colors of variables: wff set class |
Syntax hints: = wceq 1331 ∈ wcel 1480 ∃wrex 2417 (class class class)co 5774 ℝcr 7619 0cc0 7620 1c1 7621 + caddc 7623 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-5 1423 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-4 1487 ax-17 1506 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-1re 7714 ax-addrcl 7717 ax-rnegex 7729 |
This theorem depends on definitions: df-bi 116 df-nf 1437 df-cleq 2132 df-clel 2135 df-ral 2421 df-rex 2422 |
This theorem is referenced by: 0red 7767 0xr 7812 axmulgt0 7836 gtso 7843 0lt1 7889 ine0 8156 ltaddneg 8186 addgt0 8210 addgegt0 8211 addgtge0 8212 addge0 8213 ltaddpos 8214 ltneg 8224 leneg 8227 lt0neg1 8230 lt0neg2 8231 le0neg1 8232 le0neg2 8233 addge01 8234 suble0 8238 0le1 8243 gt0ne0i 8248 gt0ne0d 8274 lt0ne0d 8275 recexre 8340 recexgt0 8342 inelr 8346 rimul 8347 1ap0 8352 reapmul1 8357 apsqgt0 8363 msqge0 8378 mulge0 8381 recexaplem2 8413 recexap 8414 rerecclap 8490 ltm1 8604 recgt0 8608 ltmul12a 8618 lemul12a 8620 mulgt1 8621 gt0div 8628 ge0div 8629 recgt1i 8656 recreclt 8658 sup3exmid 8715 crap0 8716 nnge1 8743 nngt0 8745 nnrecgt0 8758 0ne1 8787 0le0 8809 neg1lt0 8828 halfge0 8936 iap0 8943 nn0ssre 8981 nn0ge0 9002 nn0nlt0 9003 nn0le0eq0 9005 0mnnnnn0 9009 elnnnn0b 9021 elnnnn0c 9022 elnnz 9064 0z 9065 elnnz1 9077 nn0lt10b 9131 recnz 9144 gtndiv 9146 fnn0ind 9167 rpge0 9454 rpnegap 9474 0nrp 9477 0ltpnf 9568 mnflt0 9570 xneg0 9614 xaddid1 9645 xnn0xadd0 9650 xposdif 9665 elrege0 9759 0e0icopnf 9762 0elunit 9769 1elunit 9770 divelunit 9785 lincmb01cmp 9786 iccf1o 9787 unitssre 9788 modqelico 10107 modqmuladdim 10140 addmodid 10145 expubnd 10350 le2sq2 10368 bernneq2 10413 expnbnd 10415 expnlbnd 10416 faclbnd 10487 faclbnd3 10489 faclbnd6 10490 bcval4 10498 bcpasc 10512 reim0 10633 re0 10667 im0 10668 rei 10671 imi 10672 cj0 10673 caucvgre 10753 rennim 10774 sqrt0rlem 10775 sqrt0 10776 resqrexlemdecn 10784 resqrexlemnm 10790 resqrexlemgt0 10792 sqrt00 10812 sqrt9 10820 sqrt2gt1lt2 10821 leabs 10846 ltabs 10859 sqrtpclii 10902 max0addsup 10991 fimaxre2 10998 climge0 11094 iserge0 11112 fsum00 11231 arisum2 11268 0.999... 11290 cos0 11437 ef01bndlem 11463 sin01bnd 11464 cos01bnd 11465 cos2bnd 11467 sin01gt0 11468 cos01gt0 11469 sincos2sgn 11472 sin4lt0 11473 absef 11476 absefib 11477 efieq1re 11478 epos 11487 flodddiv4 11631 gcdn0gt0 11666 nn0seqcvgd 11722 algcvgblem 11730 algcvga 11732 ssblps 12594 ssbl 12595 xmeter 12605 cnbl0 12703 pilem3 12864 pipos 12869 sinhalfpilem 12872 sincosq1sgn 12907 sincosq2sgn 12908 sinq34lt0t 12912 coseq0q4123 12915 coseq00topi 12916 coseq0negpitopi 12917 tangtx 12919 sincos4thpi 12921 sincos6thpi 12923 cosordlem 12930 cosq34lt1 12931 cos02pilt1 12932 ex-gcd 12943 trilpolemclim 13229 trilpolemcl 13230 trilpolemisumle 13231 trilpolemeq1 13233 trilpolemlt1 13234 |
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