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Mathbox for Glauco Siliprandi |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > iunxsnf | Structured version Visualization version GIF version |
Description: A singleton index picks out an instance of an indexed union's argument. (Contributed by Glauco Siliprandi, 17-Aug-2020.) |
Ref | Expression |
---|---|
iunxsnf.1 | ⊢ Ⅎ𝑥𝐶 |
iunxsnf.2 | ⊢ 𝐴 ∈ V |
iunxsnf.3 | ⊢ (𝑥 = 𝐴 → 𝐵 = 𝐶) |
Ref | Expression |
---|---|
iunxsnf | ⊢ ∪ 𝑥 ∈ {𝐴}𝐵 = 𝐶 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | iunxsnf.2 | . 2 ⊢ 𝐴 ∈ V | |
2 | iunxsnf.1 | . . 3 ⊢ Ⅎ𝑥𝐶 | |
3 | iunxsnf.3 | . . 3 ⊢ (𝑥 = 𝐴 → 𝐵 = 𝐶) | |
4 | 2, 3 | iunxsngf 5097 | . 2 ⊢ (𝐴 ∈ V → ∪ 𝑥 ∈ {𝐴}𝐵 = 𝐶) |
5 | 1, 4 | ax-mp 5 | 1 ⊢ ∪ 𝑥 ∈ {𝐴}𝐵 = 𝐶 |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1537 ∈ wcel 2106 Ⅎwnfc 2888 Vcvv 3478 {csn 4631 ∪ ciun 4996 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-12 2175 ax-ext 2706 |
This theorem depends on definitions: df-bi 207 df-an 396 df-3an 1088 df-tru 1540 df-ex 1777 df-nf 1781 df-sb 2063 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-rex 3069 df-v 3480 df-sbc 3792 df-sn 4632 df-iun 4998 |
This theorem is referenced by: fiiuncl 45005 iunp1 45006 sge0iunmptlemfi 46369 |
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