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Mirrors > Home > MPE Home > Th. List > Mathboxes > snssl | Structured version Visualization version GIF version |
Description: If a singleton is a subclass of another class, then the singleton's element is an element of that other class. This theorem is the right-to-left implication of the biconditional snss 4710. The proof of this theorem was automatically generated from snsslVD 41040 using a tools command file, translateMWO.cmd, by translating the proof into its non-virtual deduction form and minimizing it. (Contributed by Alan Sare, 25-Aug-2011.) (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
snssl.1 | ⊢ 𝐴 ∈ V |
Ref | Expression |
---|---|
snssl | ⊢ ({𝐴} ⊆ 𝐵 → 𝐴 ∈ 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | snssl.1 | . . 3 ⊢ 𝐴 ∈ V | |
2 | 1 | snid 4591 | . 2 ⊢ 𝐴 ∈ {𝐴} |
3 | ssel2 3959 | . 2 ⊢ (({𝐴} ⊆ 𝐵 ∧ 𝐴 ∈ {𝐴}) → 𝐴 ∈ 𝐵) | |
4 | 2, 3 | mpan2 687 | 1 ⊢ ({𝐴} ⊆ 𝐵 → 𝐴 ∈ 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 2105 Vcvv 3492 ⊆ wss 3933 {csn 4557 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1787 ax-4 1801 ax-5 1902 ax-6 1961 ax-7 2006 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2151 ax-12 2167 ax-ext 2790 |
This theorem depends on definitions: df-bi 208 df-an 397 df-or 842 df-tru 1531 df-ex 1772 df-nf 1776 df-sb 2061 df-clab 2797 df-cleq 2811 df-clel 2890 df-nfc 2960 df-v 3494 df-in 3940 df-ss 3949 df-sn 4558 |
This theorem is referenced by: (None) |
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