It is called an Ellipsis the plural is ellipses. It is written as three dots like this ... Here is an example: 1, 1/2, 1/4,1/8,... This means that the sequence 1/2n goes on forever.
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The equal sign with the slash means "is not equal to".
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= is the equals sign + is the plus sign * is the multiplication sign / is the divide sign - is the minus sign
In math expression means when you have a number sentence without an equal sign.A mathematical or algebraic expression is a collection of terms that do not include an equality sign because it is not an equation. A mathematical or algebraic expression is a collection of terms that do not include an equality sign because it is not an equation.