| Mathbox for BJ |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > ILE Home > Th. List > Mathboxes > bj-nnen2lp | GIF version | ||
| Description: A version of en2lp 4658 for natural numbers, which does not require
ax-setind 4641.
Note: using this theorem and bj-nnelirr 16649, one can remove dependency on ax-setind 4641 from nntri2 6705 and nndcel 6711; one can actually remove more dependencies from these. (Contributed by BJ, 28-Nov-2019.) (Proof modification is discouraged.) |
| Ref | Expression |
|---|---|
| bj-nnen2lp | ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → ¬ (𝐴 ∈ 𝐵 ∧ 𝐵 ∈ 𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | bj-nnelirr 16649 | . . 3 ⊢ (𝐵 ∈ ω → ¬ 𝐵 ∈ 𝐵) | |
| 2 | 1 | adantl 277 | . 2 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → ¬ 𝐵 ∈ 𝐵) |
| 3 | bj-nntrans 16647 | . . . . 5 ⊢ (𝐵 ∈ ω → (𝐴 ∈ 𝐵 → 𝐴 ⊆ 𝐵)) | |
| 4 | 3 | adantl 277 | . . . 4 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → (𝐴 ∈ 𝐵 → 𝐴 ⊆ 𝐵)) |
| 5 | ssel 3222 | . . . 4 ⊢ (𝐴 ⊆ 𝐵 → (𝐵 ∈ 𝐴 → 𝐵 ∈ 𝐵)) | |
| 6 | 4, 5 | syl6 33 | . . 3 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → (𝐴 ∈ 𝐵 → (𝐵 ∈ 𝐴 → 𝐵 ∈ 𝐵))) |
| 7 | 6 | impd 254 | . 2 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → ((𝐴 ∈ 𝐵 ∧ 𝐵 ∈ 𝐴) → 𝐵 ∈ 𝐵)) |
| 8 | 2, 7 | mtod 669 | 1 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → ¬ (𝐴 ∈ 𝐵 ∧ 𝐵 ∈ 𝐴)) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 104 ∈ wcel 2202 ⊆ wss 3201 ωcom 4694 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2204 ax-14 2205 ax-ext 2213 ax-nul 4220 ax-pr 4305 ax-un 4536 ax-bd0 16509 ax-bdor 16512 ax-bdn 16513 ax-bdal 16514 ax-bdex 16515 ax-bdeq 16516 ax-bdel 16517 ax-bdsb 16518 ax-bdsep 16580 ax-infvn 16637 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ral 2516 df-rex 2517 df-rab 2520 df-v 2805 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-nul 3497 df-sn 3679 df-pr 3680 df-uni 3899 df-int 3934 df-suc 4474 df-iom 4695 df-bdc 16537 df-bj-ind 16623 |
| This theorem is referenced by: bj-peano4 16651 |
| Copyright terms: Public domain | W3C validator |