| Mathbox for Filip Cernatescu |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > problem5 | Structured version Visualization version GIF version | ||
| Description: Practice problem 5. Clues: 3brtr3i 5142 mpbi 233 breqtri 5138 ltaddsubi 11792 remulcli 11242 2re 12332 3re 12338 9re 12357 eqcomi 2774 mvlladdi 11493 3cn 6cn 12349 eqtr3i 2790 6p3e9 12417 addcomi 11418 ltdiv1ii 12161 6re 12348 nngt0i 12292 2nn 12331 divcan3i 11978 recni 11240 2cn 12333 2ne0 12364 mpbir 234 eqtri 2788 mulcomi 11234 3t2e6 12423 divmuli 11986. (Contributed by Filip Cernatescu, 16-Mar-2019.) (Proof modification is discouraged.) |
| Ref | Expression |
|---|---|
| problem5.1 | ⊢ 𝐴 ∈ ℝ |
| problem5.2 | ⊢ ((2 · 𝐴) + 3) < 9 |
| Ref | Expression |
|---|---|
| problem5 | ⊢ 𝐴 < 3 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | problem5.2 | . . . . 5 ⊢ ((2 · 𝐴) + 3) < 9 | |
| 2 | 2re 12332 | . . . . . . 7 ⊢ 2 ∈ ℝ | |
| 3 | problem5.1 | . . . . . . 7 ⊢ 𝐴 ∈ ℝ | |
| 4 | 2, 3 | remulcli 11242 | . . . . . 6 ⊢ (2 · 𝐴) ∈ ℝ |
| 5 | 3re 12338 | . . . . . 6 ⊢ 3 ∈ ℝ | |
| 6 | 9re 12357 | . . . . . 6 ⊢ 9 ∈ ℝ | |
| 7 | 4, 5, 6 | ltaddsubi 11792 | . . . . 5 ⊢ (((2 · 𝐴) + 3) < 9 ↔ (2 · 𝐴) < (9 − 3)) |
| 8 | 1, 7 | mpbi 233 | . . . 4 ⊢ (2 · 𝐴) < (9 − 3) |
| 9 | 3cn 12339 | . . . . . 6 ⊢ 3 ∈ ℂ | |
| 10 | 6cn 12349 | . . . . . 6 ⊢ 6 ∈ ℂ | |
| 11 | 6p3e9 12417 | . . . . . . . 8 ⊢ (6 + 3) = 9 | |
| 12 | 10, 9 | addcomi 11418 | . . . . . . . 8 ⊢ (6 + 3) = (3 + 6) |
| 13 | 11, 12 | eqtr3i 2790 | . . . . . . 7 ⊢ 9 = (3 + 6) |
| 14 | 13 | eqcomi 2774 | . . . . . 6 ⊢ (3 + 6) = 9 |
| 15 | 9, 10, 14 | mvlladdi 11493 | . . . . 5 ⊢ 6 = (9 − 3) |
| 16 | 15 | eqcomi 2774 | . . . 4 ⊢ (9 − 3) = 6 |
| 17 | 8, 16 | breqtri 5138 | . . 3 ⊢ (2 · 𝐴) < 6 |
| 18 | 6re 12348 | . . . 4 ⊢ 6 ∈ ℝ | |
| 19 | 2nn 12331 | . . . . 5 ⊢ 2 ∈ ℕ | |
| 20 | 19 | nngt0i 12292 | . . . 4 ⊢ 0 < 2 |
| 21 | 4, 18, 2, 20 | ltdiv1ii 12161 | . . 3 ⊢ ((2 · 𝐴) < 6 ↔ ((2 · 𝐴) / 2) < (6 / 2)) |
| 22 | 17, 21 | mpbi 233 | . 2 ⊢ ((2 · 𝐴) / 2) < (6 / 2) |
| 23 | 3 | recni 11240 | . . 3 ⊢ 𝐴 ∈ ℂ |
| 24 | 2cn 12333 | . . 3 ⊢ 2 ∈ ℂ | |
| 25 | 2ne0 12364 | . . 3 ⊢ 2 ≠ 0 | |
| 26 | 23, 24, 25 | divcan3i 11978 | . 2 ⊢ ((2 · 𝐴) / 2) = 𝐴 |
| 27 | 24, 9 | mulcomi 11234 | . . . 4 ⊢ (2 · 3) = (3 · 2) |
| 28 | 3t2e6 12423 | . . . 4 ⊢ (3 · 2) = 6 | |
| 29 | 27, 28 | eqtri 2788 | . . 3 ⊢ (2 · 3) = 6 |
| 30 | 10, 24, 9, 25 | divmuli 11986 | . . 3 ⊢ ((6 / 2) = 3 ↔ (2 · 3) = 6) |
| 31 | 29, 30 | mpbir 234 | . 2 ⊢ (6 / 2) = 3 |
| 32 | 22, 26, 31 | 3brtr3i 5142 | 1 ⊢ 𝐴 < 3 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1570 ∈ wcel 2146 class class class wbr 5111 (class class class)co 7419 ℝcr 11116 + caddc 11120 · cmul 11122 < clt 11260 − cmin 11458 / cdiv 11888 2c2 12312 3c3 12313 6c6 12316 9c9 12319 |
| 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 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-sep 5259 ax-nul 5271 ax-pow 5338 ax-pr 5406 ax-un 7742 ax-resscn 11174 ax-1cn 11175 ax-icn 11176 ax-addcl 11177 ax-addrcl 11178 ax-mulcl 11179 ax-mulrcl 11180 ax-mulcom 11181 ax-addass 11182 ax-mulass 11183 ax-distr 11184 ax-i2m1 11185 ax-1ne0 11186 ax-1rid 11187 ax-rnegex 11188 ax-rrecex 11189 ax-cnre 11190 ax-pre-lttri 11191 ax-pre-lttrn 11192 ax-pre-ltadd 11193 ax-pre-mulgt0 11194 |
| 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 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3067 df-ral 3082 df-rex 3092 df-rmo 3371 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-iun 4960 df-br 5112 df-opab 5176 df-mpt 5195 df-tr 5221 df-id 5558 df-eprel 5563 df-po 5571 df-so 5572 df-fr 5616 df-we 5618 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-pred 6306 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7376 df-ov 7422 df-oprab 7423 df-mpo 7424 df-om 7869 df-2nd 7993 df-frecs 8284 df-wrecs 8315 df-recs 8364 df-rdg 8403 df-er 8700 df-en 8950 df-dom 8951 df-sdom 8952 df-pnf 11262 df-mnf 11263 df-xr 11264 df-ltxr 11265 df-le 11266 df-sub 11460 df-neg 11461 df-div 11889 df-nn 12251 df-2 12320 df-3 12321 df-4 12322 df-5 12323 df-6 12324 df-7 12325 df-8 12326 df-9 12327 |
| This theorem is used by: (None) |
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