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    • Numbers that are in the numerators

      • The letters a and b mean: the numbers that are in the numerators. The letter c means: the number in the denominator. The rule means: "Whatever those numbers are, add the numerators and write their sum over the common denominator."
      themathpage.com/Alg/algebraic-expressions.htm
  1. Comprehensive collection of 225+ math symbols used in algebra, categorized by subject and type into tables along with each symbol's name, usage and example.

  2. A = {3,7,9,14}, B = {9,14,28} A ∩ B: intersection: objects that belong to set A and set B: A ∩ B = {9,14} A ∪ B: union: objects that belong to set A or set B: A ∪ B = {3,7,9,14,28} A ⊆ B: subset: A is a subset of B. set A is included in set B. {9,14,28} ⊆ {9,14,28} A ⊂ B: proper subset / strict subset: A is a subset of B, but A is ...

  3. Common Symbols Used in Algebra. Symbols save time and space when writing. Here are the most common algebraic symbols: Symbol. Meaning. Example.

    Symbol
    Meaning
    Example
    +
    add
    3+7 = 10
    subtract
    5−2 = 3
    ×
    multiply
    4×3 = 12
    ·
    multiply (as "×" can look like "x")
    4·3 = 12
  4. A⇒B means that if A is true, B must also be true, but if A is false, B is unknown. x=3⇒x 2 =9, but x 2 =9⇒x=3 is false, because x could also be -3.

    Symbol
    Name
    Read As
    Meaning
    =
    Equal
    is equal to
    If x=y, x and y represent the same value ...
    Definition
    is defined as
    If x≡y, x is defined as another name of ...
    Approximately equal
    is approximately equal to
    If x≈y, x and y are almost equal.
    Inequation
    does not equal, is not equal to
    If x≠y, x and y do not represent the same ...
  5. 2. If a and b are real numbers, , or +, and a < b, then (,) denotes the open interval delimited by a and b. See ] , [for an alternative notation. 3. If a and b are integers, (,) may denote the greatest common divisor of a and b.

  6. The study of algebra becomes a little easier once you understand the basic rules. Here are some examples: a³ means a x a x a (but 3a means a + a + a). bd³ means b x d x d x d (you only cube the d). 3y² means 3 x y x y (you only square the y). (bd)³ means b x d x b x d x b x d. f means f ÷ c. c.

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  8. The letters a and b mean: the numbers that are in the numerators. The letter c means: the number in the denominator. The rule means: "Whatever those numbers are, add the numerators. and write their sum over the common denominator." Algebra is telling us how to do any problem that looks like that.

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