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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
+\ No newline at end of file