Approximately 3.14159. π 2 6 = 1 1 2 + 1 2 2 + ⋯. , If you wish, you can also save this list of mathematical symbols in … and See § Brackets for examples of use. 2. Unicode Math Symbols ∑ ∫ π² ∞. a To view any of the lessons below click on link. , However, they are still used on a black board for indicating relationships between formulas. a and Energy measure used for air conditioners: Abbr. {1, 6} ⊄ C: A ⊇ B: Superset: A has same elements as B, or more {1, 2, 3} ⊇ {1, 2, 3} A ⊃ B: Proper Superset: A has B's elements and more {1, 2, 3, 4} ⊃ {1, 2, 3} A ⊅ B: Not a Superset: A is not a superset of B {1, 2, 6} ⊅ {1, 9} A c: Complement: elements not in A: D c = {1, 2, 6, 7} When = {1, 2, 3, 4, 5, 6… 6 ∈ 1: ℤ: integer numbers set = {...-3,-2,-1,0,1,2,3,...}-6 ∈ ℚ: rational numbers set = {x | x=a/b, a,b∈ and b≠0} 2/6 ∈ ℝ: real numbers set = {x | -∞ < x <∞} 6.343434 ∈ ℂ: complex numbers set = {z | z=a+bi, -∞

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