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| Mirrors > Home > MPE Home > Th. List > divlt1lt | Structured version Visualization version GIF version | ||
| Description: A real number divided by a positive real number is less than 1 iff the real number is less than the positive real number. (Contributed by AV, 25-May-2020.) |
| Ref | Expression |
|---|---|
| divlt1lt | ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ+) → ((𝐴 / 𝐵) < 1 ↔ 𝐴 < 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simpl 488 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ+) → 𝐴 ∈ ℝ) | |
| 2 | rpregt0 13061 | . . . 4 ⊢ (𝐵 ∈ ℝ+ → (𝐵 ∈ ℝ ∧ 0 < 𝐵)) | |
| 3 | 2 | adantl 487 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ+) → (𝐵 ∈ ℝ ∧ 0 < 𝐵)) |
| 4 | 1re 11236 | . . . . 5 ⊢ 1 ∈ ℝ | |
| 5 | 0lt1 11764 | . . . . 5 ⊢ 0 < 1 | |
| 6 | 4, 5 | pm3.2i 476 | . . . 4 ⊢ (1 ∈ ℝ ∧ 0 < 1) |
| 7 | 6 | a1i 11 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ+) → (1 ∈ ℝ ∧ 0 < 1)) |
| 8 | ltdiv23 12134 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ (𝐵 ∈ ℝ ∧ 0 < 𝐵) ∧ (1 ∈ ℝ ∧ 0 < 1)) → ((𝐴 / 𝐵) < 1 ↔ (𝐴 / 1) < 𝐵)) | |
| 9 | 1, 3, 7, 8 | syl3anc 1398 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ+) → ((𝐴 / 𝐵) < 1 ↔ (𝐴 / 1) < 𝐵)) |
| 10 | recn 11218 | . . . . 5 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℂ) | |
| 11 | 10 | div1d 12011 | . . . 4 ⊢ (𝐴 ∈ ℝ → (𝐴 / 1) = 𝐴) |
| 12 | 11 | adantr 486 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ+) → (𝐴 / 1) = 𝐴) |
| 13 | 12 | breq1d 5117 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ+) → ((𝐴 / 1) < 𝐵 ↔ 𝐴 < 𝐵)) |
| 14 | 9, 13 | bitrd 282 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ+) → ((𝐴 / 𝐵) < 1 ↔ 𝐴 < 𝐵)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2145 class class class wbr 5107 (class class class)co 7417 ℝcr 11127 0cc0 11128 1c1 11129 < clt 11271 / cdiv 11899 ℝ+crp 13046 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7740 ax-resscn 11185 ax-1cn 11186 ax-icn 11187 ax-addcl 11188 ax-addrcl 11189 ax-mulcl 11190 ax-mulrcl 11191 ax-mulcom 11192 ax-addass 11193 ax-mulass 11194 ax-distr 11195 ax-i2m1 11196 ax-1ne0 11197 ax-1rid 11198 ax-rnegex 11199 ax-rrecex 11200 ax-cnre 11201 ax-pre-lttri 11202 ax-pre-lttrn 11203 ax-pre-ltadd 11204 ax-pre-mulgt0 11205 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-rmo 3367 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-br 5108 df-opab 5172 df-mpt 5191 df-id 5554 df-po 5567 df-so 5568 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7374 df-ov 7420 df-oprab 7421 df-mpo 7422 df-er 8700 df-en 8957 df-dom 8958 df-sdom 8959 df-pnf 11273 df-mnf 11274 df-xr 11275 df-ltxr 11276 df-le 11277 df-sub 11471 df-neg 11472 df-div 11900 df-rp 13047 |
| This theorem is used by: adddivflid 13883 divfl0 13889 flodddiv4 16511 dp2lt10 33337 dp2ltc 33340 dplti 33358 dignnld 49541 |
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