| 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 5139 mpbi 233 breqtri 5135 ltaddsubi 11781 remulcli 11231 2re 12321 3re 12327 9re 12346 eqcomi 2771 mvlladdi 11482 3cn 6cn 12338 eqtr3i 2787 6p3e9 12406 addcomi 11407 ltdiv1ii 12150 6re 12337 nngt0i 12281 2nn 12320 divcan3i 11967 recni 11229 2cn 12322 2ne0 12353 mpbir 234 eqtri 2785 mulcomi 11223 3t2e6 12412 divmuli 11975. (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 12321 | . . . . . . 7 ⊢ 2 ∈ ℝ | |
| 3 | problem5.1 | . . . . . . 7 ⊢ 𝐴 ∈ ℝ | |
| 4 | 2, 3 | remulcli 11231 | . . . . . 6 ⊢ (2 · 𝐴) ∈ ℝ |
| 5 | 3re 12327 | . . . . . 6 ⊢ 3 ∈ ℝ | |
| 6 | 9re 12346 | . . . . . 6 ⊢ 9 ∈ ℝ | |
| 7 | 4, 5, 6 | ltaddsubi 11781 | . . . . 5 ⊢ (((2 · 𝐴) + 3) < 9 ↔ (2 · 𝐴) < (9 − 3)) |
| 8 | 1, 7 | mpbi 233 | . . . 4 ⊢ (2 · 𝐴) < (9 − 3) |
| 9 | 3cn 12328 | . . . . . 6 ⊢ 3 ∈ ℂ | |
| 10 | 6cn 12338 | . . . . . 6 ⊢ 6 ∈ ℂ | |
| 11 | 6p3e9 12406 | . . . . . . . 8 ⊢ (6 + 3) = 9 | |
| 12 | 10, 9 | addcomi 11407 | . . . . . . . 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 11482 | . . . . 5 ⊢ 6 = (9 − 3) |
| 16 | 15 | eqcomi 2771 | . . . 4 ⊢ (9 − 3) = 6 |
| 17 | 8, 16 | breqtri 5135 | . . 3 ⊢ (2 · 𝐴) < 6 |
| 18 | 6re 12337 | . . . 4 ⊢ 6 ∈ ℝ | |
| 19 | 2nn 12320 | . . . . 5 ⊢ 2 ∈ ℕ | |
| 20 | 19 | nngt0i 12281 | . . . 4 ⊢ 0 < 2 |
| 21 | 4, 18, 2, 20 | ltdiv1ii 12150 | . . 3 ⊢ ((2 · 𝐴) < 6 ↔ ((2 · 𝐴) / 2) < (6 / 2)) |
| 22 | 17, 21 | mpbi 233 | . 2 ⊢ ((2 · 𝐴) / 2) < (6 / 2) |
| 23 | 3 | recni 11229 | . . 3 ⊢ 𝐴 ∈ ℂ |
| 24 | 2cn 12322 | . . 3 ⊢ 2 ∈ ℂ | |
| 25 | 2ne0 12353 | . . 3 ⊢ 2 ≠ 0 | |
| 26 | 23, 24, 25 | divcan3i 11967 | . 2 ⊢ ((2 · 𝐴) / 2) = 𝐴 |
| 27 | 24, 9 | mulcomi 11223 | . . . 4 ⊢ (2 · 3) = (3 · 2) |
| 28 | 3t2e6 12412 | . . . 4 ⊢ (3 · 2) = 6 | |
| 29 | 27, 28 | eqtri 2785 | . . 3 ⊢ (2 · 3) = 6 |
| 30 | 10, 24, 9, 25 | divmuli 11975 | . . 3 ⊢ ((6 / 2) = 3 ↔ (2 · 3) = 6) |
| 31 | 29, 30 | mpbir 234 | . 2 ⊢ (6 / 2) = 3 |
| 32 | 22, 26, 31 | 3brtr3i 5139 | 1 ⊢ 𝐴 < 3 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1569 ∈ wcel 2142 class class class wbr 5108 (class class class)co 7412 ℝcr 11105 + caddc 11109 · cmul 11111 < clt 11249 − cmin 11447 / cdiv 11877 2c2 12301 3c3 12302 6c6 12305 9c9 12308 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1824 ax-4 1838 ax-5 1939 ax-6 1996 ax-7 2037 ax-8 2144 ax-9 2152 ax-10 2175 ax-11 2191 ax-12 2212 ax-ext 2734 ax-sep 5256 ax-nul 5268 ax-pow 5335 ax-pr 5403 ax-un 7734 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1103 df-3an 1104 df-tru 1572 df-fal 1582 df-ex 1809 df-nf 1813 df-sb 2096 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 3368 df-reu 3369 df-rab 3416 df-v 3456 df-sbc 3744 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4487 df-pw 4563 df-sn 4589 df-pr 4591 df-op 4595 df-uni 4872 df-iun 4957 df-br 5109 df-opab 5173 df-mpt 5192 df-tr 5218 df-id 5555 df-eprel 5560 df-po 5568 df-so 5569 df-fr 5613 df-we 5615 df-xp 5666 df-rel 5667 df-cnv 5668 df-co 5669 df-dm 5670 df-rn 5671 df-res 5672 df-ima 5673 df-pred 6302 df-ord 6363 df-on 6364 df-lim 6365 df-suc 6366 df-iota 6492 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7861 df-2nd 7985 df-frecs 8276 df-wrecs 8307 df-recs 8356 df-rdg 8395 df-er 8692 df-en 8942 df-dom 8943 df-sdom 8944 df-pnf 11251 df-mnf 11252 df-xr 11253 df-ltxr 11254 df-le 11255 df-sub 11449 df-neg 11450 df-div 11878 df-nn 12240 df-2 12309 df-3 12310 df-4 12311 df-5 12312 df-6 12313 df-7 12314 df-8 12315 df-9 12316 |
| This theorem is used by: (None) |
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