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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 9207 | . . 3 ⊢ 3 ∈ ℝ | |
| 2 | 1re 8168 | . . 3 ⊢ 1 ∈ ℝ | |
| 3 | 3pos 9227 | . . 3 ⊢ 0 < 3 | |
| 4 | 0lt1 8296 | . . 3 ⊢ 0 < 1 | |
| 5 | 1, 2, 3, 4 | addgt0ii 8661 | . 2 ⊢ 0 < (3 + 1) |
| 6 | df-4 9194 | . 2 ⊢ 4 = (3 + 1) | |
| 7 | 5, 6 | breqtrri 4113 | 1 ⊢ 0 < 4 |
| Colors of variables: wff set class |
| Syntax hints: class class class wbr 4086 (class class class)co 6013 0cc0 8022 1c1 8023 + caddc 8025 < clt 8204 3c3 9185 4c4 9186 |
| 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 4205 ax-pow 4262 ax-pr 4297 ax-un 4528 ax-setind 4633 ax-cnex 8113 ax-resscn 8114 ax-1cn 8115 ax-1re 8116 ax-icn 8117 ax-addcl 8118 ax-addrcl 8119 ax-mulcl 8120 ax-addcom 8122 ax-addass 8124 ax-i2m1 8127 ax-0lt1 8128 ax-0id 8130 ax-rnegex 8131 ax-pre-lttrn 8136 ax-pre-ltadd 8138 |
| 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 2802 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-uni 3892 df-br 4087 df-opab 4149 df-xp 4729 df-iota 5284 df-fv 5332 df-ov 6016 df-pnf 8206 df-mnf 8207 df-ltxr 8209 df-2 9192 df-3 9193 df-4 9194 |
| This theorem is referenced by: 4ne0 9231 4ap0 9232 5pos 9233 8th4div3 9353 div4p1lem1div2 9388 fldiv4p1lem1div2 10555 iexpcyc 10896 faclbnd2 10994 resqrexlemover 11561 resqrexlemcalc1 11565 resqrexlemcalc2 11566 resqrexlemcalc3 11567 resqrexlemnm 11569 resqrexlemga 11574 sqrt2gt1lt2 11600 flodddiv4 12487 dveflem 15440 coseq0negpitopi 15550 sincos4thpi 15554 gausslemma2dlem0d 15771 |
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