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A math expression is a symbol or combination of symbols that represents a quantity or a relationship between quantities.
There are used to encapsulate a relationship between two or more variables.
symetry is part of math, based on angles and numbers
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It means that there is no mapping between the two sets of data or between the input and output values. The phrase is often incorrectly used when there is no linear relationship found between two variables, through regression or correlation analysis. Often there can be a non-linear relationship.