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| Mirrors > Home > MPE Home > Th. List > mulcomnq | Structured version Visualization version GIF version | ||
| Description: Multiplication of positive fractions is commutative. (Contributed by NM, 31-Aug-1995.) (Revised by Mario Carneiro, 28-Apr-2013.) (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| mulcomnq | ⊢ (𝐴 ·Q 𝐵) = (𝐵 ·Q 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | mulcompq 10875 | . . . 4 ⊢ (𝐴 ·pQ 𝐵) = (𝐵 ·pQ 𝐴) | |
| 2 | 1 | fveq2i 6844 | . . 3 ⊢ ([Q]‘(𝐴 ·pQ 𝐵)) = ([Q]‘(𝐵 ·pQ 𝐴)) |
| 3 | mulpqnq 10864 | . . 3 ⊢ ((𝐴 ∈ Q ∧ 𝐵 ∈ Q) → (𝐴 ·Q 𝐵) = ([Q]‘(𝐴 ·pQ 𝐵))) | |
| 4 | mulpqnq 10864 | . . . 4 ⊢ ((𝐵 ∈ Q ∧ 𝐴 ∈ Q) → (𝐵 ·Q 𝐴) = ([Q]‘(𝐵 ·pQ 𝐴))) | |
| 5 | 4 | ancoms 458 | . . 3 ⊢ ((𝐴 ∈ Q ∧ 𝐵 ∈ Q) → (𝐵 ·Q 𝐴) = ([Q]‘(𝐵 ·pQ 𝐴))) |
| 6 | 2, 3, 5 | 3eqtr4a 2798 | . 2 ⊢ ((𝐴 ∈ Q ∧ 𝐵 ∈ Q) → (𝐴 ·Q 𝐵) = (𝐵 ·Q 𝐴)) |
| 7 | mulnqf 10872 | . . . 4 ⊢ ·Q :(Q × Q)⟶Q | |
| 8 | 7 | fdmi 6680 | . . 3 ⊢ dom ·Q = (Q × Q) |
| 9 | 8 | ndmovcom 7554 | . 2 ⊢ (¬ (𝐴 ∈ Q ∧ 𝐵 ∈ Q) → (𝐴 ·Q 𝐵) = (𝐵 ·Q 𝐴)) |
| 10 | 6, 9 | pm2.61i 182 | 1 ⊢ (𝐴 ·Q 𝐵) = (𝐵 ·Q 𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: ∧ wa 395 = wceq 1542 ∈ wcel 2114 × cxp 5629 ‘cfv 6499 (class class class)co 7367 ·pQ cmpq 10772 Qcnq 10775 [Q]cerq 10777 ·Q cmq 10779 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5232 ax-nul 5242 ax-pr 5376 ax-un 7689 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-rmo 3343 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6266 df-ord 6327 df-on 6328 df-lim 6329 df-suc 6330 df-iota 6455 df-fun 6501 df-fn 6502 df-f 6503 df-f1 6504 df-fo 6505 df-f1o 6506 df-fv 6507 df-ov 7370 df-oprab 7371 df-mpo 7372 df-om 7818 df-1st 7942 df-2nd 7943 df-frecs 8231 df-wrecs 8262 df-recs 8311 df-rdg 8349 df-1o 8405 df-oadd 8409 df-omul 8410 df-er 8643 df-ni 10795 df-mi 10797 df-lti 10798 df-mpq 10832 df-enq 10834 df-nq 10835 df-erq 10836 df-mq 10838 df-1nq 10839 |
| This theorem is referenced by: recmulnq 10887 recrecnq 10890 halfnq 10899 ltrnq 10902 addclprlem1 10939 addclprlem2 10940 mulclprlem 10942 mulclpr 10943 mulcompr 10946 distrlem4pr 10949 1idpr 10952 prlem934 10956 prlem936 10970 reclem3pr 10972 reclem4pr 10973 |
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