Definition: An operator L is said to be linearif
i) k*L[f] = L[(k*f)]
ii) L[f + g] = L[f] + L[g]
where k is a constant and f and g are functions.
Definition: An equation is said to be linear if it is of the form
a1x1 + a2x2 + a3x3 + . . . = 0
where a1, a2, a3, . . . are constants and x1, x2, x3, . . . are variables.
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a unit of linear measure
It is usually a linear measure in the downward direction.
The definition is never ending. It simply can mean forever and ever. Also refer to: http://en.wikipedia.org/wiki/Infinity
the mean (in math) is the average of all the numbers in the problem
Mathematics is not mean. It is the purest form of knowledge!