18.12. Let the function f be entire and f(z) o as z o. Show that f must have at least one zero.
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- For T:P5P3 and nullity(T)=4, find rank(T).Express the solution of the given IVP in terms of a convolution where g(t) is an arbitrary function.Suppose that f(x, t) is the probability of getting x suc-cesses during a time interval of length t when (i) the probability of a success during a very small time intervalfrom t to t + t is α · t, (ii) the probability of more thanone success during such a time interval is negligible, and (iii) the probability of a success during such a time inter-val does not depend on what happened prior to time t. (a) Show that under these conditions d[f(x, t)]dt = α[f(x − 1, t) − f(x, t)] (b) Show by direct substitution that a solution of thisinfinite system of differential equations (there is one foreach value of x) is given by the Poisson distribution withλ = αt.
- If g(g(x)) is continous at 0, then g(x) is continous at 0. True or False?2. Give the condition which ensure that |ez| < 1 where z in C.Suppose that f(x, t) is the probability of getting x successes during a time interval of length t when (i) the probability of a success during a very small time interval from t to t +t is α · t, (ii) the probability of more than one success during such a time interval is negligible, and (iii) the probability of a success during such a time inter-val does not depend on what happened prior to time t. (a) Show that under these conditions f(x, t +t) = f(x, t)[1−α · t]+f(x−1, t)α · t and hence that d[f(x, t)] dt = α[f(x−1, t)−f(x, t)] (b) Show by direct substitution that a solution of this infinite system of differential equations (there is one for each value of x) is given by the Poisson distribution with λ = αt.
- Suppose that r1 and r2 are roots of ar2 + br + c = 0 and that r1 ≠ r2; then exp(r1t) and exp(r2t) are solutions of the differential equation ay″ + by′ + cy = 0. Show that ϕ(t; r1, r2) = (exp(r2t) − exp(r1t))/(r2 − r1) is also a solution of the equation for r2 ≠ r1. Then think of r1 as fixed, and use l’Hôpital’s rule to evaluate the limit of ϕ(t; r1, r2) as r2 → r1, thereby obtaining the second solution in the case of equal roots.Suppose that we don't have a formula for g(x) but we know that g(1) = −3 and g'(x) = (x2 + 8)^1/2 for all x. Use a linear approximation to estimate g(0.99) and g(1.01). g(0.99) ≈ g(1.01) ≈Suppose that ƒ(x) = x2 and g(x) = | x | . Then thecompositions( ƒ ∘ g)(x) = | x | 2 = x2 and (g ∘ ƒ)(x) = | x2| = x2 are both differentiable at x = 0 even though g itself is not differentiable at x = 0. Does this contradict the Chain Rule? Explain.