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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
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.
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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 ...
Common Symbols Used in Algebra. Symbols save time and space when writing. Here are the most common algebraic symbols: Symbol. Meaning. Example.
SymbolMeaningExample+add3+7 = 10−subtract5−2 = 3×multiply4×3 = 12·multiply (as "×" can look like "x")4·3 = 12A⇒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.
SymbolNameRead AsMeaning=Equalis equal toIf x=y, x and y represent the same value ...≡Definitionis defined asIf x≡y, x is defined as another name of ...≈Approximately equalis approximately equal toIf x≈y, x and y are almost equal.≠Inequationdoes not equal, is not equal toIf x≠y, x and y do not represent the same ...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.
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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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.