Theorem xppss12 42860

Description: Proper subset theorem for Cartesian product. (Contributed by Steven Nguyen, 17-Jul-2022.)

Assertion

Ref	Expression
xppss12	⊢ ((𝐴 ⊊ 𝐵 ∧ 𝐶 ⊊ 𝐷) → (𝐴 × 𝐶) ⊊ (𝐵 × 𝐷))

Proof of Theorem xppss12

Step	Hyp	Ref	Expression
1		pssss 4054	. . 3 ⊢ (𝐴 ⊊ 𝐵 → 𝐴 ⊆ 𝐵)
2		pssss 4054	. . 3 ⊢ (𝐶 ⊊ 𝐷 → 𝐶 ⊆ 𝐷)
3		xpss12 5667	. . 3 ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐶 ⊆ 𝐷) → (𝐴 × 𝐶) ⊆ (𝐵 × 𝐷))
4	1, 2, 3	syl2an 607	. 2 ⊢ ((𝐴 ⊊ 𝐵 ∧ 𝐶 ⊊ 𝐷) → (𝐴 × 𝐶) ⊆ (𝐵 × 𝐷))
5		simpl 487	. . . . 5 ⊢ ((𝐴 ⊊ 𝐵 ∧ 𝐶 ⊊ 𝐷) → 𝐴 ⊊ 𝐵)
6		pssne 4055	. . . . . 6 ⊢ (𝐴 ⊊ 𝐵 → 𝐴 ≠ 𝐵)
7	6	necomd 3015	. . . . 5 ⊢ (𝐴 ⊊ 𝐵 → 𝐵 ≠ 𝐴)
8		neneq 2966	. . . . . 6 ⊢ (𝐵 ≠ 𝐴 → ¬ 𝐵 = 𝐴)
9	8	intnanrd 494	. . . . 5 ⊢ (𝐵 ≠ 𝐴 → ¬ (𝐵 = 𝐴 ∧ 𝐷 = 𝐶))
10	5, 7, 9	3syl 19	. . . 4 ⊢ ((𝐴 ⊊ 𝐵 ∧ 𝐶 ⊊ 𝐷) → ¬ (𝐵 = 𝐴 ∧ 𝐷 = 𝐶))
11		pssn0 42858	. . . . 5 ⊢ (𝐴 ⊊ 𝐵 → 𝐵 ≠ ∅)
12		pssn0 42858	. . . . 5 ⊢ (𝐶 ⊊ 𝐷 → 𝐷 ≠ ∅)
13		xp11 6165	. . . . 5 ⊢ ((𝐵 ≠ ∅ ∧ 𝐷 ≠ ∅) → ((𝐵 × 𝐷) = (𝐴 × 𝐶) ↔ (𝐵 = 𝐴 ∧ 𝐷 = 𝐶)))
14	11, 12, 13	syl2an 607	. . . 4 ⊢ ((𝐴 ⊊ 𝐵 ∧ 𝐶 ⊊ 𝐷) → ((𝐵 × 𝐷) = (𝐴 × 𝐶) ↔ (𝐵 = 𝐴 ∧ 𝐷 = 𝐶)))
15	10, 14	mtbird 328	. . 3 ⊢ ((𝐴 ⊊ 𝐵 ∧ 𝐶 ⊊ 𝐷) → ¬ (𝐵 × 𝐷) = (𝐴 × 𝐶))
16		neqne 2968	. . . 4 ⊢ (¬ (𝐵 × 𝐷) = (𝐴 × 𝐶) → (𝐵 × 𝐷) ≠ (𝐴 × 𝐶))
17	16	necomd 3015	. . 3 ⊢ (¬ (𝐵 × 𝐷) = (𝐴 × 𝐶) → (𝐴 × 𝐶) ≠ (𝐵 × 𝐷))
18	15, 17	syl 18	. 2 ⊢ ((𝐴 ⊊ 𝐵 ∧ 𝐶 ⊊ 𝐷) → (𝐴 × 𝐶) ≠ (𝐵 × 𝐷))
19		df-pss 3927	. 2 ⊢ ((𝐴 × 𝐶) ⊊ (𝐵 × 𝐷) ↔ ((𝐴 × 𝐶) ⊆ (𝐵 × 𝐷) ∧ (𝐴 × 𝐶) ≠ (𝐵 × 𝐷)))
20	4, 18, 19	sylanbrc 594	1 ⊢ ((𝐴 ⊊ 𝐵 ∧ 𝐶 ⊊ 𝐷) → (𝐴 × 𝐶) ⊊ (𝐵 × 𝐷))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 209   ∧ wa 400   = wceq 1563   ≠ wne 2960   ⊆ wss 3907   ⊊ wpss 3908  ∅c0 4288   × cxp 5650

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1818  ax-4 1832  ax-5 1933  ax-6 1990  ax-7 2031  ax-8 2147  ax-9 2155  ax-11 2194  ax-ext 2737  ax-sep 5251  ax-pr 5395

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1566  df-fal 1576  df-ex 1803  df-sb 2094  df-clab 2744  df-cleq 2757  df-clel 2840  df-ne 2961  df-ral 3080  df-rex 3090  df-rab 3418  df-v 3459  df-dif 3910  df-un 3912  df-in 3914  df-ss 3924  df-pss 3927  df-nul 4289  df-if 4484  df-sn 4586  df-pr 4588  df-op 4592  df-br 5106  df-opab 5168  df-xp 5658  df-rel 5659  df-cnv 5660  df-dm 5662  df-rn 5663

This theorem is referenced by: (None)