Confusion regarding notation/symbol?

1. What symbolizes confusion?
2. What does this ∉ symbol mean?
3. What does this symbol mean ⊆?
4. What you mean by the notations ∀ and ∃?

What symbolizes confusion?

Zigzag: Path, confusion.

What does this ∉ symbol mean?

(vii) The symbol '∉' stands for 'does not belongs to' also for 'is not an element of'. Therefore, x ∉ A will read as 'x does not belongs to set A' or 'x is not an element of the set A'.

What does this symbol mean ⊆?

The symbol "⊆" means "is a subset of". The symbol "⊂" means "is a proper subset of". Example. Since all of the members of set A are members of set D, A is a subset of D. Symbolically this is represented as A ⊆ D.

What you mean by the notations ∀ and ∃?

The symbol ∀ is used to denote a universal quantifier, and the symbol ∃ is used to denote an existential quantifier. Using this notation, the statement “For each real number x, x2 > 0” could be written in symbolic form as: (∀x∈R)(x2>0). The following is an example of a statement involving an existential quantifier.