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| Mirrors > Home > MPE Home > Th. List > nulsltsd | Structured version Visualization version GIF version | ||
| Description: The empty set is less-than any set of surreals. Deduction version. (Contributed by Scott Fenton, 27-Feb-2026.) |
| Ref | Expression |
|---|---|
| nulsltsd.1 | ⊢ (𝜑 → 𝐴 ∈ 𝑉) |
| nulsltsd.2 | ⊢ (𝜑 → 𝐴 ⊆ No ) |
| Ref | Expression |
|---|---|
| nulsltsd | ⊢ (𝜑 → ∅ <<s 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nulsltsd.1 | . . 3 ⊢ (𝜑 → 𝐴 ∈ 𝑉) | |
| 2 | nulsltsd.2 | . . 3 ⊢ (𝜑 → 𝐴 ⊆ No ) | |
| 3 | 1, 2 | elpwd 4573 | . 2 ⊢ (𝜑 → 𝐴 ∈ 𝒫 No ) |
| 4 | nulslts 28005 | . 2 ⊢ (𝐴 ∈ 𝒫 No → ∅ <<s 𝐴) | |
| 5 | 3, 4 | syl 18 | 1 ⊢ (𝜑 → ∅ <<s 𝐴) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2146 ⊆ wss 3908 ∅c0 4289 𝒫 cpw 4567 class class class wbr 5114 No csur 27841 <<s cslts 27987 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-ext 2738 ax-sep 5262 ax-nul 5274 ax-pr 5409 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2745 df-cleq 2758 df-clel 2841 df-ral 3083 df-rex 3093 df-rab 3420 df-v 3460 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-nul 4290 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-br 5115 df-opab 5179 df-xp 5672 df-slts 27988 |
| This theorem is used by: (None) |
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