| 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 2772 eqtri 2786 subaddrii 11521 recni 11197 4re 12303 3re 12299 1re 11182 df-4 12283 addcomi 11375. (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 12303 | . . . . . 6 ⊢ 4 ∈ ℝ | |
| 2 | 1 | recni 11197 | . . . . 5 ⊢ 4 ∈ ℂ |
| 3 | 3re 12299 | . . . . . 6 ⊢ 3 ∈ ℝ | |
| 4 | 3 | recni 11197 | . . . . 5 ⊢ 3 ∈ ℂ |
| 5 | 1re 11182 | . . . . . 6 ⊢ 1 ∈ ℝ | |
| 6 | 5 | recni 11197 | . . . . 5 ⊢ 1 ∈ ℂ |
| 7 | df-4 12283 | . . . . . 6 ⊢ 4 = (3 + 1) | |
| 8 | 7 | eqcomi 2772 | . . . . 5 ⊢ (3 + 1) = 4 |
| 9 | 2, 4, 6, 8 | subaddrii 11521 | . . . 4 ⊢ (4 − 3) = 1 |
| 10 | 9 | eqcomi 2772 | . . 3 ⊢ 1 = (4 − 3) |
| 11 | problem3.1 | . . . 4 ⊢ 𝐴 ∈ ℂ | |
| 12 | 4, 11 | addcomi 11375 | . . . . 5 ⊢ (3 + 𝐴) = (𝐴 + 3) |
| 13 | problem3.2 | . . . . 5 ⊢ (𝐴 + 3) = 4 | |
| 14 | 12, 13 | eqtri 2786 | . . . 4 ⊢ (3 + 𝐴) = 4 |
| 15 | 2, 4, 11, 14 | subaddrii 11521 | . . 3 ⊢ (4 − 3) = 𝐴 |
| 16 | 10, 15 | eqtri 2786 | . 2 ⊢ 1 = 𝐴 |
| 17 | 16 | eqcomi 2772 | 1 ⊢ 𝐴 = 1 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1561 ∈ wcel 2143 (class class class)co 7397 ℂcc 11072 1c1 11075 + caddc 11077 − cmin 11415 3c3 12274 4c4 12275 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1816 ax-4 1830 ax-5 1931 ax-6 1988 ax-7 2029 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-sep 5247 ax-nul 5257 ax-pow 5323 ax-pr 5391 ax-un 7719 ax-resscn 11131 ax-1cn 11132 ax-icn 11133 ax-addcl 11134 ax-addrcl 11135 ax-mulcl 11136 ax-mulrcl 11137 ax-mulcom 11138 ax-addass 11139 ax-mulass 11140 ax-distr 11141 ax-i2m1 11142 ax-1ne0 11143 ax-1rid 11144 ax-rnegex 11145 ax-rrecex 11146 ax-cnre 11147 ax-pre-lttri 11148 ax-pre-lttrn 11149 ax-pre-ltadd 11150 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1100 df-3an 1101 df-tru 1564 df-fal 1574 df-ex 1801 df-nf 1805 df-sb 2092 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-nel 3063 df-ral 3078 df-rex 3088 df-reu 3369 df-rab 3416 df-v 3457 df-sbc 3746 df-csb 3854 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-nul 4287 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-br 5102 df-opab 5164 df-mpt 5183 df-id 5543 df-po 5556 df-so 5557 df-xp 5654 df-rel 5655 df-cnv 5656 df-co 5657 df-dm 5658 df-rn 5659 df-res 5660 df-ima 5661 df-iota 6478 df-fun 6524 df-fn 6525 df-f 6526 df-f1 6527 df-fo 6528 df-f1o 6529 df-fv 6530 df-riota 7354 df-ov 7400 df-oprab 7401 df-mpo 7402 df-er 8679 df-en 8929 df-dom 8930 df-sdom 8931 df-pnf 11219 df-mnf 11220 df-ltxr 11222 df-sub 11417 df-2 12281 df-3 12282 df-4 12283 |
| This theorem is referenced by: (None) |
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