| Metamath Proof Explorer |
< Previous
Next >
Related theorems GIF version |
| Description: A cross product is included in the ordered pair universe. Exercise 3 of [TakeutiZaring] p. 25. |
| Ref | Expression |
|---|---|
| xpss | ⊢ (A × B) ⊆ (V × V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pm3.26 256 | . . . . 5 ⊢ ((z = 〈x, y〉 ∧ (x ∈ A ∧ y ∈ B)) → z = 〈x, y〉) | |
| 2 | 1 | 19.22i 723 | . . . 4 ⊢ (∃y(z = 〈x, y〉 ∧ (x ∈ A ∧ y ∈ B)) → ∃y z = 〈x, y〉) |
| 3 | 2 | 19.22i 723 | . . 3 ⊢ (∃x∃y(z = 〈x, y〉 ∧ (x ∈ A ∧ y ∈ B)) → ∃x∃y z = 〈x, y〉) |
| 4 | elxp 2442 | . . 3 ⊢ (z ∈ (A × B) ↔ ∃x∃y(z = 〈x, y〉 ∧ (x ∈ A ∧ y ∈ B))) | |
| 5 | elvv 2464 | . . 3 ⊢ (z ∈ (V × V) ↔ ∃x∃y z = 〈x, y〉) | |
| 6 | 3, 4, 5 | 3imtr4 192 | . 2 ⊢ (z ∈ (A × B) → z ∈ (V × V)) |
| 7 | 6 | ssriv 1508 | 1 ⊢ (A × B) ⊆ (V × V) |
| Colors of variables: wff set class |
| Syntax hints: ∧ wa 196 ∃wex 678 = wceq 1091 ∈ wcel 1092 Vcvv 1348 ⊆ wss 1487 〈cop 1810 × cxp 2408 |
| This theorem is referenced by: relxp 2486 relres 2591 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-pow 1077 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-v 1349 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-nul 1708 df-pw 1799 df-sn 1811 df-pr 1812 df-op 1815 df-opab 2098 df-xp 2424 |