Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > nnppipi | GIF version |
Description: A natural number plus a positive integer is a positive integer. (Contributed by Jim Kingdon, 10-Nov-2019.) |
Ref | Expression |
---|---|
nnppipi | ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ N) → (𝐴 +o 𝐵) ∈ N) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pinn 7250 | . . 3 ⊢ (𝐵 ∈ N → 𝐵 ∈ ω) | |
2 | nnacl 6448 | . . 3 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → (𝐴 +o 𝐵) ∈ ω) | |
3 | 1, 2 | sylan2 284 | . 2 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ N) → (𝐴 +o 𝐵) ∈ ω) |
4 | nnaword2 6482 | . . . . 5 ⊢ ((𝐵 ∈ ω ∧ 𝐴 ∈ ω) → 𝐵 ⊆ (𝐴 +o 𝐵)) | |
5 | 1, 4 | sylan 281 | . . . 4 ⊢ ((𝐵 ∈ N ∧ 𝐴 ∈ ω) → 𝐵 ⊆ (𝐴 +o 𝐵)) |
6 | 5 | ancoms 266 | . . 3 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ N) → 𝐵 ⊆ (𝐴 +o 𝐵)) |
7 | elni2 7255 | . . . . 5 ⊢ (𝐵 ∈ N ↔ (𝐵 ∈ ω ∧ ∅ ∈ 𝐵)) | |
8 | 7 | simprbi 273 | . . . 4 ⊢ (𝐵 ∈ N → ∅ ∈ 𝐵) |
9 | 8 | adantl 275 | . . 3 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ N) → ∅ ∈ 𝐵) |
10 | 6, 9 | sseldd 3143 | . 2 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ N) → ∅ ∈ (𝐴 +o 𝐵)) |
11 | elni2 7255 | . 2 ⊢ ((𝐴 +o 𝐵) ∈ N ↔ ((𝐴 +o 𝐵) ∈ ω ∧ ∅ ∈ (𝐴 +o 𝐵))) | |
12 | 3, 10, 11 | sylanbrc 414 | 1 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ N) → (𝐴 +o 𝐵) ∈ N) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ∈ wcel 2136 ⊆ wss 3116 ∅c0 3409 ωcom 4567 (class class class)co 5842 +o coa 6381 Ncnpi 7213 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-13 2138 ax-14 2139 ax-ext 2147 ax-coll 4097 ax-sep 4100 ax-nul 4108 ax-pow 4153 ax-pr 4187 ax-un 4411 ax-setind 4514 ax-iinf 4565 |
This theorem depends on definitions: df-bi 116 df-dc 825 df-3an 970 df-tru 1346 df-fal 1349 df-nf 1449 df-sb 1751 df-eu 2017 df-mo 2018 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-ne 2337 df-ral 2449 df-rex 2450 df-reu 2451 df-rab 2453 df-v 2728 df-sbc 2952 df-csb 3046 df-dif 3118 df-un 3120 df-in 3122 df-ss 3129 df-nul 3410 df-pw 3561 df-sn 3582 df-pr 3583 df-op 3585 df-uni 3790 df-int 3825 df-iun 3868 df-br 3983 df-opab 4044 df-mpt 4045 df-tr 4081 df-id 4271 df-iord 4344 df-on 4346 df-suc 4349 df-iom 4568 df-xp 4610 df-rel 4611 df-cnv 4612 df-co 4613 df-dm 4614 df-rn 4615 df-res 4616 df-ima 4617 df-iota 5153 df-fun 5190 df-fn 5191 df-f 5192 df-f1 5193 df-fo 5194 df-f1o 5195 df-fv 5196 df-ov 5845 df-oprab 5846 df-mpo 5847 df-1st 6108 df-2nd 6109 df-recs 6273 df-irdg 6338 df-oadd 6388 df-ni 7245 |
This theorem is referenced by: nqpnq0nq 7394 prarloclemlt 7434 prarloclemlo 7435 prarloclemcalc 7443 |
Copyright terms: Public domain | W3C validator |