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By коллектив

Ten hot climate designs from vintage Elites Spring 2010 assortment. Hand knitting styles for clothes together with a protracted belted vest (pictured on cover), a lace and rib pullover, a feather and fan cardi, a knee size skirt, and extra.

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7 47 8. The Gompertz equation is 1st order separable. Separating the variables, we find that Z Z dV = dt V (α − β ln(V )) 1 ⇒ − ln |α − β ln(V )| = t + C β ⇒ α − β ln(V ) = Ae−βt (A = ±e−βC ) A ⇒ V (t) = exp(α/β) exp(− e−βt ) β → exp(α/β) exp(0) (as t → ∞) (since β > 0). Thus, V (t) → eα/β as t → ∞. (Note. 1 Preamble Here we will look at 2nd order linear ODEs. These are ODEs which can be written in the form y 00 + f (x)y 0 + g(x)y = r(x) where f (x), g(x) and r(x) are given functions of x. The ODE above is said to be homogeneous if r(x) ≡ 0.

Dx x 5. Solve the ODE y0 = x y + ( )3 x y subject to y(1) = 1. We let y = x·u(x). This gives y 0 = x·u0 (x)+u. Substituting into the given ODE, we find that 1 du 1 = ( )3 . x · u0 (x) + u = u + ( )3 ⇒ x u dx u 32 We obtain a separable ODE in u(x) which may be rewritten as Z u3 du = Z dx . x The above can be integrated to give u4 = ln |x| + C 4 where C is an arbitrary constant. Replacing u back by y/x, we obtain 1 y 4 ( ) = ln |x| + C ⇒ y 4 = 4x4 ln |x| + 4Cx4 . 4 x The above gives rise to two general solutions, namely y(x) = ±(4x4 ln |x| + 4Cx4 )1/4 .

2 General solution of homogeneous 2nd order linear ODE If two linearly independent solutions of a homogeneous 2nd order linear ODE can be found, they can be used to construct the general solution of the ODE. 1 Linearly independent functions Two functions f (x) and g(x) are said to be linearly independent over the interval [a, b] (that is, over the interval a ≤ x ≤ b), if and only if we cannot find constants α and β, other than α and β both being zero, such that αf (x) + βg(x) = 0 for all x in [a, b].

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