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Walsh functions, 744 systems, 744 wave amplitude, 82 frequency, 82 length, 82 period, 82 phase, 82 plane, 741 wave equation -dimensional, 536 one-dimensional, 732 Schrodinger equation, 539 wave function classical problem, 536 heat-conduction equation, 537 Schrodinger equation, 538 wavelet, 741 Daubechies, 742 Haar, 741 Mexican hat, 741 orthogonal, 742 transformation, 740, 741 discrete, 743 discrete, Haar, 743 dyadic, 742 fast, 743 Weber differential equation, 545 function, 509 wedge, 154 Weibull distribution, 761 Weierstrass approximation theorem, 607 criterion uniform convergence, 415 function, 705 theorem, 414 one variable, 60 several variables, 123 weight measurement, 793 of orthogonality, 515 statistical, 753 weighting factor, statistical, 790 witch of Agnesi, 94 word, 604 work (mechanics) general, 469 special, 451 Wronskian determinant, 500, 802 zero-point vibration energy, 546 zeropoint, 1 z-transformation, 733 convolution, 736 damping, 736 definition, 734 difference, 735 differentiation, 736 integration, 736 inverse, 737 original sequence, 734 rules of calculation, 735 summation, 735 transform, 734 translation, 735 z-transformable, 734