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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 9378 | . . 3 ⊢ 3 ∈ ℝ | |
| 2 | 1re 8325 | . . 3 ⊢ 1 ∈ ℝ | |
| 3 | 3pos 9398 | . . 3 ⊢ 0 < 3 | |
| 4 | 0lt1 8453 | . . 3 ⊢ 0 < 1 | |
| 5 | 1, 2, 3, 4 | addgt0ii 8819 | . 2 ⊢ 0 < (3 + 1) |
| 6 | df-4 9365 | . 2 ⊢ 4 = (3 + 1) | |
| 7 | 5, 6 | breqtrri 4157 | 1 ⊢ 0 < 4 |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: class class class wbr 4130 (class class class)co 6085 0cc0 8179 1c1 8180 + caddc 8182 < clt 8360 3c3 9356 4c4 9357 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 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-14 2212 ax-ext 2220 ax-sep 4249 ax-pow 4311 ax-pr 4346 ax-un 4578 ax-setind 4684 ax-cnex 8270 ax-resscn 8271 ax-1cn 8272 ax-1re 8273 ax-icn 8274 ax-addcl 8275 ax-addrcl 8276 ax-mulcl 8277 ax-addcom 8279 ax-addass 8281 ax-i2m1 8284 ax-0lt1 8285 ax-0id 8287 ax-rnegex 8288 ax-pre-lttrn 8293 ax-pre-ltadd 8295 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-rab 2537 df-v 2823 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-br 4131 df-opab 4193 df-xp 4780 df-iota 5337 df-fv 5385 df-ov 6088 df-pnf 8362 df-mnf 8363 df-ltxr 8365 df-2 9363 df-3 9364 df-4 9365 |
| This theorem is used by: 4ne0 9402 4ap0 9403 5pos 9404 8th4div3 9524 div4p1lem1div2 9559 fldiv4p1lem1div2 10740 iexpcyc 11081 faclbnd2 11180 resqrexlemover 11776 resqrexlemcalc1 11780 resqrexlemcalc2 11781 resqrexlemcalc3 11782 resqrexlemnm 11784 resqrexlemga 11789 sqrt2gt1lt2 11815 flodddiv4 12703 dveflem 15827 coseq0negpitopi 15937 sincos4thpi 15941 gausslemma2dlem0d 16171 |
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