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Mirrors > Home > MPE Home > Th. List > mulidpi | Structured version Visualization version GIF version |
Description: 1 is an identity element for multiplication on positive integers. (Contributed by NM, 4-Mar-1996.) (Revised by Mario Carneiro, 17-Nov-2014.) (New usage is discouraged.) |
Ref | Expression |
---|---|
mulidpi | ⊢ (𝐴 ∈ N → (𝐴 ·N 1o) = 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1pi 10305 | . . 3 ⊢ 1o ∈ N | |
2 | mulpiord 10307 | . . 3 ⊢ ((𝐴 ∈ N ∧ 1o ∈ N) → (𝐴 ·N 1o) = (𝐴 ·o 1o)) | |
3 | 1, 2 | mpan2 689 | . 2 ⊢ (𝐴 ∈ N → (𝐴 ·N 1o) = (𝐴 ·o 1o)) |
4 | pinn 10300 | . . 3 ⊢ (𝐴 ∈ N → 𝐴 ∈ ω) | |
5 | nnm1 8275 | . . 3 ⊢ (𝐴 ∈ ω → (𝐴 ·o 1o) = 𝐴) | |
6 | 4, 5 | syl 17 | . 2 ⊢ (𝐴 ∈ N → (𝐴 ·o 1o) = 𝐴) |
7 | 3, 6 | eqtrd 2856 | 1 ⊢ (𝐴 ∈ N → (𝐴 ·N 1o) = 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1537 ∈ wcel 2114 (class class class)co 7156 ωcom 7580 1oc1o 8095 ·o comu 8100 Ncnpi 10266 ·N cmi 10268 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-tp 4572 df-op 4574 df-uni 4839 df-iun 4921 df-br 5067 df-opab 5129 df-mpt 5147 df-tr 5173 df-id 5460 df-eprel 5465 df-po 5474 df-so 5475 df-fr 5514 df-we 5516 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-pred 6148 df-ord 6194 df-on 6195 df-lim 6196 df-suc 6197 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-ov 7159 df-oprab 7160 df-mpo 7161 df-om 7581 df-wrecs 7947 df-recs 8008 df-rdg 8046 df-1o 8102 df-oadd 8106 df-omul 8107 df-ni 10294 df-mi 10296 |
This theorem is referenced by: 1nqenq 10384 mulidnq 10385 1lt2nq 10395 archnq 10402 prlem934 10455 |
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