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'''Orthogonal Functions'''
 
</dt><BR/>A set of functions, any two of which, by analogy to orthogonal [[Vectors|vectors]], vanish 
if their product is summed by integration over a specified interval. 
</dd><BR/>''For example, f(x) and g(x) are orthogonal in the interval x = a to x = 
b if 
<center>'''Missing Image:img src="SP7_o_files/ortho1.gif"'''</center>
The functions are also said to be normal if 
<center>'''Missing Image:img src="SP7_o_files/ortho2.gif"'''</center> The most familiar examples of such functions, 
many of which have great importance in mathematical physics, are the sine and 
cosine functions between zero and 2pi. ''
</dd>
==References==
''This article is based on NASA's [[NASA SP-7|Dictionary of Technical Terms for Aerospace Use]]''
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