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Mirrors > Home > MPE Home > Th. List > inabs | Structured version Visualization version GIF version |
Description: Absorption law for intersection. (Contributed by NM, 16-Apr-2006.) |
Ref | Expression |
---|---|
inabs | ⊢ (𝐴 ∩ (𝐴 ∪ 𝐵)) = 𝐴 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssun1 4150 | . 2 ⊢ 𝐴 ⊆ (𝐴 ∪ 𝐵) | |
2 | df-ss 3954 | . 2 ⊢ (𝐴 ⊆ (𝐴 ∪ 𝐵) ↔ (𝐴 ∩ (𝐴 ∪ 𝐵)) = 𝐴) | |
3 | 1, 2 | mpbi 232 | 1 ⊢ (𝐴 ∩ (𝐴 ∪ 𝐵)) = 𝐴 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1537 ∪ cun 3936 ∩ cin 3937 ⊆ wss 3938 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-v 3498 df-un 3943 df-in 3945 df-ss 3954 |
This theorem is referenced by: dfif5 4485 caragenuncllem 42801 |
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