| 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 5129 mpbi 232 breqtri 5125 ltaddsubi 11748 remulcli 11198 2re 12292 3re 12298 9re 12317 eqcomi 2771 mvlladdi 11449 3cn 6cn 12309 eqtr3i 2787 6p3e9 12377 addcomi 11374 ltdiv1ii 12121 6re 12308 nngt0i 12252 2nn 12291 divcan3i 11937 recni 11196 2cn 12293 2ne0 12324 mpbir 233 eqtri 2785 mulcomi 11190 3t2e6 12383 divmuli 11945. (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 12292 | . . . . . . 7 ⊢ 2 ∈ ℝ | |
| 3 | problem5.1 | . . . . . . 7 ⊢ 𝐴 ∈ ℝ | |
| 4 | 2, 3 | remulcli 11198 | . . . . . 6 ⊢ (2 · 𝐴) ∈ ℝ |
| 5 | 3re 12298 | . . . . . 6 ⊢ 3 ∈ ℝ | |
| 6 | 9re 12317 | . . . . . 6 ⊢ 9 ∈ ℝ | |
| 7 | 4, 5, 6 | ltaddsubi 11748 | . . . . 5 ⊢ (((2 · 𝐴) + 3) < 9 ↔ (2 · 𝐴) < (9 − 3)) |
| 8 | 1, 7 | mpbi 232 | . . . 4 ⊢ (2 · 𝐴) < (9 − 3) |
| 9 | 3cn 12299 | . . . . . 6 ⊢ 3 ∈ ℂ | |
| 10 | 6cn 12309 | . . . . . 6 ⊢ 6 ∈ ℂ | |
| 11 | 6p3e9 12377 | . . . . . . . 8 ⊢ (6 + 3) = 9 | |
| 12 | 10, 9 | addcomi 11374 | . . . . . . . 8 ⊢ (6 + 3) = (3 + 6) |
| 13 | 11, 12 | eqtr3i 2787 | . . . . . . 7 ⊢ 9 = (3 + 6) |
| 14 | 13 | eqcomi 2771 | . . . . . 6 ⊢ (3 + 6) = 9 |
| 15 | 9, 10, 14 | mvlladdi 11449 | . . . . 5 ⊢ 6 = (9 − 3) |
| 16 | 15 | eqcomi 2771 | . . . 4 ⊢ (9 − 3) = 6 |
| 17 | 8, 16 | breqtri 5125 | . . 3 ⊢ (2 · 𝐴) < 6 |
| 18 | 6re 12308 | . . . 4 ⊢ 6 ∈ ℝ | |
| 19 | 2nn 12291 | . . . . 5 ⊢ 2 ∈ ℕ | |
| 20 | 19 | nngt0i 12252 | . . . 4 ⊢ 0 < 2 |
| 21 | 4, 18, 2, 20 | ltdiv1ii 12121 | . . 3 ⊢ ((2 · 𝐴) < 6 ↔ ((2 · 𝐴) / 2) < (6 / 2)) |
| 22 | 17, 21 | mpbi 232 | . 2 ⊢ ((2 · 𝐴) / 2) < (6 / 2) |
| 23 | 3 | recni 11196 | . . 3 ⊢ 𝐴 ∈ ℂ |
| 24 | 2cn 12293 | . . 3 ⊢ 2 ∈ ℂ | |
| 25 | 2ne0 12324 | . . 3 ⊢ 2 ≠ 0 | |
| 26 | 23, 24, 25 | divcan3i 11937 | . 2 ⊢ ((2 · 𝐴) / 2) = 𝐴 |
| 27 | 24, 9 | mulcomi 11190 | . . . 4 ⊢ (2 · 3) = (3 · 2) |
| 28 | 3t2e6 12383 | . . . 4 ⊢ (3 · 2) = 6 | |
| 29 | 27, 28 | eqtri 2785 | . . 3 ⊢ (2 · 3) = 6 |
| 30 | 10, 24, 9, 25 | divmuli 11945 | . . 3 ⊢ ((6 / 2) = 3 ↔ (2 · 3) = 6) |
| 31 | 29, 30 | mpbir 233 | . 2 ⊢ (6 / 2) = 3 |
| 32 | 22, 26, 31 | 3brtr3i 5129 | 1 ⊢ 𝐴 < 3 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1560 ∈ wcel 2142 class class class wbr 5100 (class class class)co 7396 ℝcr 11072 + caddc 11076 · cmul 11078 < clt 11216 − cmin 11414 / cdiv 11844 2c2 12272 3c3 12273 6c6 12276 9c9 12279 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1815 ax-4 1829 ax-5 1930 ax-6 1987 ax-7 2028 ax-8 2144 ax-9 2152 ax-10 2175 ax-11 2191 ax-12 2212 ax-ext 2734 ax-sep 5246 ax-nul 5256 ax-pow 5322 ax-pr 5390 ax-un 7718 ax-resscn 11130 ax-1cn 11131 ax-icn 11132 ax-addcl 11133 ax-addrcl 11134 ax-mulcl 11135 ax-mulrcl 11136 ax-mulcom 11137 ax-addass 11138 ax-mulass 11139 ax-distr 11140 ax-i2m1 11141 ax-1ne0 11142 ax-1rid 11143 ax-rnegex 11144 ax-rrecex 11145 ax-cnre 11146 ax-pre-lttri 11147 ax-pre-lttrn 11148 ax-pre-ltadd 11149 ax-pre-mulgt0 11150 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1099 df-3an 1100 df-tru 1563 df-fal 1573 df-ex 1800 df-nf 1804 df-sb 2091 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3367 df-reu 3368 df-rab 3415 df-v 3456 df-sbc 3745 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4481 df-pw 4557 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-iun 4951 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5542 df-eprel 5547 df-po 5555 df-so 5556 df-fr 5600 df-we 5602 df-xp 5653 df-rel 5654 df-cnv 5655 df-co 5656 df-dm 5657 df-rn 5658 df-res 5659 df-ima 5660 df-pred 6288 df-ord 6349 df-on 6350 df-lim 6351 df-suc 6352 df-iota 6477 df-fun 6523 df-fn 6524 df-f 6525 df-f1 6526 df-fo 6527 df-f1o 6528 df-fv 6529 df-riota 7353 df-ov 7399 df-oprab 7400 df-mpo 7401 df-om 7847 df-2nd 7971 df-frecs 8262 df-wrecs 8293 df-recs 8342 df-rdg 8381 df-er 8678 df-en 8928 df-dom 8929 df-sdom 8930 df-pnf 11218 df-mnf 11219 df-xr 11220 df-ltxr 11221 df-le 11222 df-sub 11416 df-neg 11417 df-div 11845 df-nn 12211 df-2 12280 df-3 12281 df-4 12282 df-5 12283 df-6 12284 df-7 12285 df-8 12286 df-9 12287 |
| This theorem is referenced by: (None) |
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