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Mirrors > Home > MPE Home > Th. List > ex-un | Structured version Visualization version GIF version |
Description: Example for df-un 3579. Example by David A. Wheeler. (Contributed by Mario Carneiro, 6-May-2015.) |
Ref | Expression |
---|---|
ex-un | ⊢ ({1, 3} ∪ {1, 8}) = {1, 3, 8} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | unass 3770 | . . 3 ⊢ (({1, 3} ∪ {1}) ∪ {8}) = ({1, 3} ∪ ({1} ∪ {8})) | |
2 | snsspr1 4345 | . . . . 5 ⊢ {1} ⊆ {1, 3} | |
3 | ssequn2 3786 | . . . . 5 ⊢ ({1} ⊆ {1, 3} ↔ ({1, 3} ∪ {1}) = {1, 3}) | |
4 | 2, 3 | mpbi 220 | . . . 4 ⊢ ({1, 3} ∪ {1}) = {1, 3} |
5 | 4 | uneq1i 3763 | . . 3 ⊢ (({1, 3} ∪ {1}) ∪ {8}) = ({1, 3} ∪ {8}) |
6 | 1, 5 | eqtr3i 2646 | . 2 ⊢ ({1, 3} ∪ ({1} ∪ {8})) = ({1, 3} ∪ {8}) |
7 | df-pr 4180 | . . 3 ⊢ {1, 8} = ({1} ∪ {8}) | |
8 | 7 | uneq2i 3764 | . 2 ⊢ ({1, 3} ∪ {1, 8}) = ({1, 3} ∪ ({1} ∪ {8})) |
9 | df-tp 4182 | . 2 ⊢ {1, 3, 8} = ({1, 3} ∪ {8}) | |
10 | 6, 8, 9 | 3eqtr4i 2654 | 1 ⊢ ({1, 3} ∪ {1, 8}) = {1, 3, 8} |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1483 ∪ cun 3572 ⊆ wss 3574 {csn 4177 {cpr 4179 {ctp 4181 1c1 9937 3c3 11071 8c8 11076 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-v 3202 df-un 3579 df-in 3581 df-ss 3588 df-pr 4180 df-tp 4182 |
This theorem is referenced by: ex-uni 27283 |
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