Show that W = {f : R → R : f(1) = 0} together with usual...
Show that W = {f : R → R : f(1) = 0} together with usual
addition and scalar multiplication forms a vector space. Let g : R
→ R and define T : W → W by T(f) = gf. Show that T is a linear
transformation.
Suppose a function f : R → R is continuous with f(0) = 1. Show
that if there is a positive number x0 for which
f(x0) = 0, then there is a smallest positive number p
for which f(p) = 0. (Hint: Consider the set {x | x > 0, f(x) =
0}.)
5. (a) Let f : R \ {−1} → R, f(x) = x+1. Show that f is
injective, but not surjective.
(b) Suppose g : R\{−1} → R\{a} is a function such that g(x) =
x−1, where a ∈ R. Determine x+1
a, show that g is bijective and determine its inverse
function.
Show that the set of all solutions to the differential
equation
f′′+f=0,
where f∈F(R), is a real vector space with respect to the usual
definition of vector addition and scalar multiplication of
functions
Let f : [0, 1] → R and suppose that, for all finite subsets of
[0, 1], 0 ≤ x1 < x2 < · · · < xn ≤ 1,
we have |f(x1) + f(x2) + · · · + f(xn)| ≤ 1. Let S := {x ∈ [0,
1] : f(x) ̸= 0}. Show that S is countable
Which of the following functions are one-to-one?
Group of answer choices
f;[−3,3]→[0,3],f(x)=9−x2f;[−3,3]→[0,3],f(x)=9−x2
f;R→R,f(x)=x3f;R→R,f(x)=x3
f;[0,∞]→[0,∞],f(x)=x2f;[0,∞]→[0,∞],f(x)=x2
A probability density function on R is a function f :R -> R
satisfying (i) f(x)≥0 or all x e R and (ii) \int_(-\infty )^(\infty
) f(x)dx = 1. For which value(s) of k e R is the function
f(x)= e^(-x^(2))\root(3)(k^(5)) a probability density function?
Explain.
Let f: [0 1] → R be a function of the class c ^ 2 that
satisfies the differential equation f '' (x) = e^xf(x) for all x in
(0,1). Show that if x0 is in (0,1) then f can not have a positive
local maximum at x0 and can not have a negative local minimum at
x0. If f (0) = f (1) = 0, prove that f = 0