Definition df-cv 10162

Description: Define the covers relation (on the Hilbert lattice). Definition 3.2.18 of [PtakPulmannova] p. 68, whose notation we use. Ptak/Pulmannova's notation A ⋖ B is read "B covers A" or "A is covered by B" , and it means that B is larger than A and there is nothing in between. See cvbrt 10165 and cvbr2t 10166 for membership relations.

Assertion

Ref	Expression
df-cv	⊢ ⋖ = {⟨x, y⟩∣((x ∈ Cℋ ⋀ y ∈ Cℋ ) ⋀ (x ⊂ y ⋀ ¬ ∃z ∈ Cℋ (x ⊂ z ⋀ z ⊂ y)))}

Distinct variable group:   x,y,z

Detailed syntax breakdown of Definition df-cv

Step	Hyp	Ref	Expression
1		ccv 8789	. 2 class ⋖
2		vx	. . . . . . 7 set x
3	2	cv 954	. . . . . 6 class x
4		cch 8753	. . . . . 6 class Cℋ
5	3, 4	wcel 957	. . . . 5 wff x ∈ Cℋ
6		vy	. . . . . . 7 set y
7	6	cv 954	. . . . . 6 class y
8	7, 4	wcel 957	. . . . 5 wff y ∈ Cℋ
9	5, 8	wa 223	. . . 4 wff (x ∈ Cℋ ⋀ y ∈ Cℋ )
10	3, 7	wpss 2045	. . . . 5 wff x ⊂ y
11		vz	. . . . . . . . . 10 set z
12	11	cv 954	. . . . . . . . 9 class z
13	3, 12	wpss 2045	. . . . . . . 8 wff x ⊂ z
14	12, 7	wpss 2045	. . . . . . . 8 wff z ⊂ y
15	13, 14	wa 223	. . . . . . 7 wff (x ⊂ z ⋀ z ⊂ y)
16	15, 11, 4	wrex 1644	. . . . . 6 wff ∃z ∈ Cℋ (x ⊂ z ⋀ z ⊂ y)
17	16	wn 2	. . . . 5 wff ¬ ∃z ∈ Cℋ (x ⊂ z ⋀ z ⊂ y)
18	10, 17	wa 223	. . . 4 wff (x ⊂ y ⋀ ¬ ∃z ∈ Cℋ (x ⊂ z ⋀ z ⊂ y))
19	9, 18	wa 223	. . 3 wff ((x ∈ Cℋ ⋀ y ∈ Cℋ ) ⋀ (x ⊂ y ⋀ ¬ ∃z ∈ Cℋ (x ⊂ z ⋀ z ⊂ y)))
20	19, 2, 6	copab 2662	. 2 class {⟨x, y⟩∣((x ∈ Cℋ ⋀ y ∈ Cℋ ) ⋀ (x ⊂ y ⋀ ¬ ∃z ∈ Cℋ (x ⊂ z ⋀ z ⊂ y)))}
21	1, 20	wceq 955	1 wff ⋖ = {⟨x, y⟩∣((x ∈ Cℋ ⋀ y ∈ Cℋ ) ⋀ (x ⊂ y ⋀ ¬ ∃z ∈ Cℋ (x ⊂ z ⋀ z ⊂ y)))}

This definition is referenced by:  cvbrt 10165

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