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| Mirrors > Home > MPE Home > Th. List > Mathboxes > bj-xpimasn | Structured version Visualization version GIF version | ||
| Description: The image of a singleton, general case. [Change and relabel xpimasn 6186 accordingly, maybe to xpima2sn.] (Contributed by BJ, 6-Apr-2019.) |
| Ref | Expression |
|---|---|
| bj-xpimasn | ⊢ ((𝐴 × 𝐵) “ {𝑋}) = if(𝑋 ∈ 𝐴, 𝐵, ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | xpima 6183 | . 2 ⊢ ((𝐴 × 𝐵) “ {𝑋}) = if((𝐴 ∩ {𝑋}) = ∅, ∅, 𝐵) | |
| 2 | disjsn 4680 | . . 3 ⊢ ((𝐴 ∩ {𝑋}) = ∅ ↔ ¬ 𝑋 ∈ 𝐴) | |
| 3 | eqid 2766 | . . 3 ⊢ 𝐵 = 𝐵 | |
| 4 | 2, 3 | ifbieq2i 4516 | . 2 ⊢ if((𝐴 ∩ {𝑋}) = ∅, ∅, 𝐵) = if(¬ 𝑋 ∈ 𝐴, ∅, 𝐵) |
| 5 | ifnot 4543 | . 2 ⊢ if(¬ 𝑋 ∈ 𝐴, ∅, 𝐵) = if(𝑋 ∈ 𝐴, 𝐵, ∅) | |
| 6 | 1, 4, 5 | 3eqtri 2793 | 1 ⊢ ((𝐴 × 𝐵) “ {𝑋}) = if(𝑋 ∈ 𝐴, 𝐵, ∅) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 = wceq 1570 ∈ wcel 2146 ∩ cin 3907 ∅c0 4289 ifcif 4490 {csn 4592 × cxp 5662 “ cima 5667 |
| 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-11 2195 ax-ext 2738 ax-sep 5260 ax-pr 5407 |
| 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-ne 2962 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 4491 df-sn 4593 df-pr 4595 df-op 4599 df-br 5113 df-opab 5177 df-xp 5670 df-rel 5671 df-cnv 5672 df-dm 5674 df-rn 5675 df-res 5676 df-ima 5677 |
| This theorem is used by: bj-xpima1sn 37624 bj-xpima2sn 37626 |
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