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Mathbox for Jonathan Ben-Naim |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > bnj923 | Structured version Visualization version GIF version |
Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.) |
Ref | Expression |
---|---|
bnj923.1 | ⊢ 𝐷 = (ω ∖ {∅}) |
Ref | Expression |
---|---|
bnj923 | ⊢ (𝑛 ∈ 𝐷 → 𝑛 ∈ ω) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eldifi 4054 | . 2 ⊢ (𝑛 ∈ (ω ∖ {∅}) → 𝑛 ∈ ω) | |
2 | bnj923.1 | . 2 ⊢ 𝐷 = (ω ∖ {∅}) | |
3 | 1, 2 | eleq2s 2908 | 1 ⊢ (𝑛 ∈ 𝐷 → 𝑛 ∈ ω) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1538 ∈ wcel 2111 ∖ cdif 3878 ∅c0 4243 {csn 4525 ωcom 7560 |
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 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-ext 2770 |
This theorem depends on definitions: df-bi 210 df-an 400 df-ex 1782 df-sb 2070 df-clab 2777 df-cleq 2791 df-clel 2870 df-v 3443 df-dif 3884 |
This theorem is referenced by: bnj1098 32165 bnj544 32276 bnj546 32278 bnj594 32294 bnj580 32295 bnj966 32326 bnj967 32327 bnj970 32329 bnj1001 32341 bnj1053 32358 bnj1071 32359 bnj1118 32366 bnj1128 32372 bnj1145 32375 |
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