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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 9259 | . . 3 ⊢ 3 ∈ ℝ | |
| 2 | 1re 8221 | . . 3 ⊢ 1 ∈ ℝ | |
| 3 | 3pos 9279 | . . 3 ⊢ 0 < 3 | |
| 4 | 0lt1 8348 | . . 3 ⊢ 0 < 1 | |
| 5 | 1, 2, 3, 4 | addgt0ii 8713 | . 2 ⊢ 0 < (3 + 1) |
| 6 | df-4 9246 | . 2 ⊢ 4 = (3 + 1) | |
| 7 | 5, 6 | breqtrri 4120 | 1 ⊢ 0 < 4 |
| Colors of variables: wff set class |
| Syntax hints: class class class wbr 4093 (class class class)co 6028 0cc0 8075 1c1 8076 + caddc 8078 < clt 8256 3c3 9237 4c4 9238 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4212 ax-pow 4270 ax-pr 4305 ax-un 4536 ax-setind 4641 ax-cnex 8166 ax-resscn 8167 ax-1cn 8168 ax-1re 8169 ax-icn 8170 ax-addcl 8171 ax-addrcl 8172 ax-mulcl 8173 ax-addcom 8175 ax-addass 8177 ax-i2m1 8180 ax-0lt1 8181 ax-0id 8183 ax-rnegex 8184 ax-pre-lttrn 8189 ax-pre-ltadd 8191 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ne 2404 df-nel 2499 df-ral 2516 df-rex 2517 df-rab 2520 df-v 2805 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-pw 3658 df-sn 3679 df-pr 3680 df-op 3682 df-uni 3899 df-br 4094 df-opab 4156 df-xp 4737 df-iota 5293 df-fv 5341 df-ov 6031 df-pnf 8258 df-mnf 8259 df-ltxr 8261 df-2 9244 df-3 9245 df-4 9246 |
| This theorem is referenced by: 4ne0 9283 4ap0 9284 5pos 9285 8th4div3 9405 div4p1lem1div2 9440 fldiv4p1lem1div2 10611 iexpcyc 10952 faclbnd2 11050 resqrexlemover 11633 resqrexlemcalc1 11637 resqrexlemcalc2 11638 resqrexlemcalc3 11639 resqrexlemnm 11641 resqrexlemga 11646 sqrt2gt1lt2 11672 flodddiv4 12560 dveflem 15520 coseq0negpitopi 15630 sincos4thpi 15634 gausslemma2dlem0d 15854 |
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