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Mirrors > Home > MPE Home > Th. List > ex-in | Structured version Visualization version GIF version |
Description: Example for df-in 3945. Example by David A. Wheeler. (Contributed by Mario Carneiro, 6-May-2015.) |
Ref | Expression |
---|---|
ex-in | ⊢ ({1, 3} ∩ {1, 8}) = {1} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-pr 4572 | . . 3 ⊢ {1, 8} = ({1} ∪ {8}) | |
2 | 1 | ineq2i 4188 | . 2 ⊢ ({1, 3} ∩ {1, 8}) = ({1, 3} ∩ ({1} ∪ {8})) |
3 | indi 4252 | . . 3 ⊢ ({1, 3} ∩ ({1} ∪ {8})) = (({1, 3} ∩ {1}) ∪ ({1, 3} ∩ {8})) | |
4 | snsspr1 4749 | . . . . . 6 ⊢ {1} ⊆ {1, 3} | |
5 | sseqin2 4194 | . . . . . 6 ⊢ ({1} ⊆ {1, 3} ↔ ({1, 3} ∩ {1}) = {1}) | |
6 | 4, 5 | mpbi 232 | . . . . 5 ⊢ ({1, 3} ∩ {1}) = {1} |
7 | 1re 10643 | . . . . . . . 8 ⊢ 1 ∈ ℝ | |
8 | 1lt8 11838 | . . . . . . . 8 ⊢ 1 < 8 | |
9 | 7, 8 | gtneii 10754 | . . . . . . 7 ⊢ 8 ≠ 1 |
10 | 3re 11720 | . . . . . . . 8 ⊢ 3 ∈ ℝ | |
11 | 3lt8 11836 | . . . . . . . 8 ⊢ 3 < 8 | |
12 | 10, 11 | gtneii 10754 | . . . . . . 7 ⊢ 8 ≠ 3 |
13 | 9, 12 | nelpri 4596 | . . . . . 6 ⊢ ¬ 8 ∈ {1, 3} |
14 | disjsn 4649 | . . . . . 6 ⊢ (({1, 3} ∩ {8}) = ∅ ↔ ¬ 8 ∈ {1, 3}) | |
15 | 13, 14 | mpbir 233 | . . . . 5 ⊢ ({1, 3} ∩ {8}) = ∅ |
16 | 6, 15 | uneq12i 4139 | . . . 4 ⊢ (({1, 3} ∩ {1}) ∪ ({1, 3} ∩ {8})) = ({1} ∪ ∅) |
17 | un0 4346 | . . . 4 ⊢ ({1} ∪ ∅) = {1} | |
18 | 16, 17 | eqtri 2846 | . . 3 ⊢ (({1, 3} ∩ {1}) ∪ ({1, 3} ∩ {8})) = {1} |
19 | 3, 18 | eqtri 2846 | . 2 ⊢ ({1, 3} ∩ ({1} ∪ {8})) = {1} |
20 | 2, 19 | eqtri 2846 | 1 ⊢ ({1, 3} ∩ {1, 8}) = {1} |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 = wceq 1537 ∈ wcel 2114 ∪ cun 3936 ∩ cin 3937 ⊆ wss 3938 ∅c0 4293 {csn 4569 {cpr 4571 1c1 10540 3c3 11696 8c8 11701 |
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 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 ax-resscn 10596 ax-1cn 10597 ax-icn 10598 ax-addcl 10599 ax-addrcl 10600 ax-mulcl 10601 ax-mulrcl 10602 ax-mulcom 10603 ax-addass 10604 ax-mulass 10605 ax-distr 10606 ax-i2m1 10607 ax-1ne0 10608 ax-1rid 10609 ax-rnegex 10610 ax-rrecex 10611 ax-cnre 10612 ax-pre-lttri 10613 ax-pre-lttrn 10614 ax-pre-ltadd 10615 ax-pre-mulgt0 10616 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-nel 3126 df-ral 3145 df-rex 3146 df-reu 3147 df-rab 3149 df-v 3498 df-sbc 3775 df-csb 3886 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-op 4576 df-uni 4841 df-br 5069 df-opab 5131 df-mpt 5149 df-id 5462 df-po 5476 df-so 5477 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-f1 6362 df-fo 6363 df-f1o 6364 df-fv 6365 df-riota 7116 df-ov 7161 df-oprab 7162 df-mpo 7163 df-er 8291 df-en 8512 df-dom 8513 df-sdom 8514 df-pnf 10679 df-mnf 10680 df-xr 10681 df-ltxr 10682 df-le 10683 df-sub 10874 df-neg 10875 df-2 11703 df-3 11704 df-4 11705 df-5 11706 df-6 11707 df-7 11708 df-8 11709 |
This theorem is referenced by: (None) |
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