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// PG (206)
// The following are the weight functions of most interest in the
// developments of this text:
// w(x)=1 a < = x < = b
// w(x)=1/sqrt(1-x^2) -1 < = x < = 1
// w(x)=exp(-x) 0 < = x < infinity
// w(x)=exp(-x^2) -infinity < x < infinity
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