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@@ -133,6 +133,7 @@ n \neq m \Rightarrow (f_n,f_m) & = & 0\\
\end{array}
$$
+which is the condition of orthonormality (the vectors are perpendicular and each has a length of 1 unit).
##Determining Coefficients of the Basis vectors
In any vector space, the inner product of a vector and its basis vector gives the coefficient. For example, consider a 2-dimensional vector as shown below: