The Exponential Solution for the Homogeneous Linear Differential Equation of the
The Exponential Solution for the Homogeneous Linear Differential Equation of the
J Mariani
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11 The notations of Sections 1 and 2 will be used without further comment. As an abbreviation, we define by (^.^) 2 cosh A = y^ + y^ = e. Now we can state Theorem 2 . If the assumptions 1, 2. , and 5 are satisfied, then (^. 5) Y = (-1)"^ I for X = X, n iS. G) e^ , is a monotonic function of x such that 0' = d0/dx is differ- ent from zero and has the same sign in the whole interval. Proof : If 0' =0, y^ + y'^ = y| - Qy^ = 0. Therefore, yJ and y^ have the same sign (since Q >0). Therefore, if 0' ...= 0, (^•7) 0^ - i^ = (y^- y^)^ + l^y^y^ - 4 = (y^- y^)^ + hy]^^ > unless '•] — . /p-' Y-i — Yo ~ '-'• (Note that yj^y^ = and y|- Qyg = implies y| = yg = 0). 12 Lemma 2. Let Q > for all x and assume that f^ is differen- tlable everyvhere. If, for a value x >0, x .
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