initial commit / add all books

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diff --git a/296/CH2/EX2.1/eg2_1.sce b/296/CH2/EX2.1/eg2_1.sce
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+//j=complex(0,1);

+//psi = A*exp(j*k*x);

+disp("px = h_cross*k(x)");

+disp("If we try to evaluate these integrals directly, we run into the problem that both numerator and denominator tend to infinity, because an ideal plane wave is strictly not a normalizable wave function. The trick to use is to choose the limits of integration from, say, -L/2 to +L/2 in a region of length L.The factor L cancels out in the numerator and denominator. Then we can consider L approaches infinity. For wave functions that are normalizable, such a mathematical trickdoes not have to be used.")
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