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| Mirrors > Home > ILE Home > Th. List > 4pos | GIF version | ||
| Description: The number 4 is positive. (Contributed by NM, 27-May-1999.) |
| Ref | Expression |
|---|---|
| 4pos | ⊢ 0 < 4 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 3re 9195 | . . 3 ⊢ 3 ∈ ℝ | |
| 2 | 1re 8156 | . . 3 ⊢ 1 ∈ ℝ | |
| 3 | 3pos 9215 | . . 3 ⊢ 0 < 3 | |
| 4 | 0lt1 8284 | . . 3 ⊢ 0 < 1 | |
| 5 | 1, 2, 3, 4 | addgt0ii 8649 | . 2 ⊢ 0 < (3 + 1) |
| 6 | df-4 9182 | . 2 ⊢ 4 = (3 + 1) | |
| 7 | 5, 6 | breqtrri 4110 | 1 ⊢ 0 < 4 |
| Colors of variables: wff set class |
| Syntax hints: class class class wbr 4083 (class class class)co 6007 0cc0 8010 1c1 8011 + caddc 8013 < clt 8192 3c3 9173 4c4 9174 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4202 ax-pow 4258 ax-pr 4293 ax-un 4524 ax-setind 4629 ax-cnex 8101 ax-resscn 8102 ax-1cn 8103 ax-1re 8104 ax-icn 8105 ax-addcl 8106 ax-addrcl 8107 ax-mulcl 8108 ax-addcom 8110 ax-addass 8112 ax-i2m1 8115 ax-0lt1 8116 ax-0id 8118 ax-rnegex 8119 ax-pre-lttrn 8124 ax-pre-ltadd 8126 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-rab 2517 df-v 2801 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-br 4084 df-opab 4146 df-xp 4725 df-iota 5278 df-fv 5326 df-ov 6010 df-pnf 8194 df-mnf 8195 df-ltxr 8197 df-2 9180 df-3 9181 df-4 9182 |
| This theorem is referenced by: 4ne0 9219 4ap0 9220 5pos 9221 8th4div3 9341 div4p1lem1div2 9376 fldiv4p1lem1div2 10537 iexpcyc 10878 faclbnd2 10976 resqrexlemover 11536 resqrexlemcalc1 11540 resqrexlemcalc2 11541 resqrexlemcalc3 11542 resqrexlemnm 11544 resqrexlemga 11549 sqrt2gt1lt2 11575 flodddiv4 12462 dveflem 15415 coseq0negpitopi 15525 sincos4thpi 15529 gausslemma2dlem0d 15746 |
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