| Mathbox for Filip Cernatescu |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > problem3 | Structured version Visualization version GIF version | ||
| Description: Practice problem 3. Clues: eqcomi 2778 eqtri 2792 subaddrii 11547 recni 11223 4re 12325 3re 12321 1re 11208 df-4 12305 addcomi 11401. (Contributed by Filip Cernatescu, 16-Mar-2019.) (Proof modification is discouraged.) |
| Ref | Expression |
|---|---|
| problem3.1 | ⊢ 𝐴 ∈ ℂ |
| problem3.2 | ⊢ (𝐴 + 3) = 4 |
| Ref | Expression |
|---|---|
| problem3 | ⊢ 𝐴 = 1 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 4re 12325 | . . . . . 6 ⊢ 4 ∈ ℝ | |
| 2 | 1 | recni 11223 | . . . . 5 ⊢ 4 ∈ ℂ |
| 3 | 3re 12321 | . . . . . 6 ⊢ 3 ∈ ℝ | |
| 4 | 3 | recni 11223 | . . . . 5 ⊢ 3 ∈ ℂ |
| 5 | 1re 11208 | . . . . . 6 ⊢ 1 ∈ ℝ | |
| 6 | 5 | recni 11223 | . . . . 5 ⊢ 1 ∈ ℂ |
| 7 | df-4 12305 | . . . . . 6 ⊢ 4 = (3 + 1) | |
| 8 | 7 | eqcomi 2778 | . . . . 5 ⊢ (3 + 1) = 4 |
| 9 | 2, 4, 6, 8 | subaddrii 11547 | . . . 4 ⊢ (4 − 3) = 1 |
| 10 | 9 | eqcomi 2778 | . . 3 ⊢ 1 = (4 − 3) |
| 11 | problem3.1 | . . . 4 ⊢ 𝐴 ∈ ℂ | |
| 12 | 4, 11 | addcomi 11401 | . . . . 5 ⊢ (3 + 𝐴) = (𝐴 + 3) |
| 13 | problem3.2 | . . . . 5 ⊢ (𝐴 + 3) = 4 | |
| 14 | 12, 13 | eqtri 2792 | . . . 4 ⊢ (3 + 𝐴) = 4 |
| 15 | 2, 4, 11, 14 | subaddrii 11547 | . . 3 ⊢ (4 − 3) = 𝐴 |
| 16 | 10, 15 | eqtri 2792 | . 2 ⊢ 1 = 𝐴 |
| 17 | 16 | eqcomi 2778 | 1 ⊢ 𝐴 = 1 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1567 ∈ wcel 2149 (class class class)co 7411 ℂcc 11098 1c1 11101 + caddc 11103 − cmin 11441 3c3 12296 4c4 12297 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-sep 5261 ax-nul 5271 ax-pow 5337 ax-pr 5405 ax-un 7733 ax-resscn 11157 ax-1cn 11158 ax-icn 11159 ax-addcl 11160 ax-addrcl 11161 ax-mulcl 11162 ax-mulrcl 11163 ax-mulcom 11164 ax-addass 11165 ax-mulass 11166 ax-distr 11167 ax-i2m1 11168 ax-1ne0 11169 ax-1rid 11170 ax-rnegex 11171 ax-rrecex 11172 ax-cnre 11173 ax-pre-lttri 11174 ax-pre-lttrn 11175 ax-pre-ltadd 11176 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-nel 3071 df-ral 3086 df-rex 3096 df-reu 3377 df-rab 3424 df-v 3465 df-sbc 3754 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-nul 4295 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4877 df-br 5114 df-opab 5178 df-mpt 5197 df-id 5557 df-po 5570 df-so 5571 df-xp 5668 df-rel 5669 df-cnv 5670 df-co 5671 df-dm 5672 df-rn 5673 df-res 5674 df-ima 5675 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 7368 df-ov 7414 df-oprab 7415 df-mpo 7416 df-er 8694 df-en 8944 df-dom 8945 df-sdom 8946 df-pnf 11245 df-mnf 11246 df-ltxr 11248 df-sub 11443 df-2 12303 df-3 12304 df-4 12305 |
| This theorem is referenced by: (None) |
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