Let G be connected, and let e be an edge of G. Prove that e is a bridge if and only if it is in every spanning tree of G.
In: Advanced Math
Show that if a function f(z) is analytic in a domain D then it has derivatives of all orders in D.
In: Advanced Math
(a) Prove the following claim: in every simple graph G on at least two vertices, we can always find two distinct vertices v,w such that deg(v) = deg(w).
(b) Prove the following claim: if G is a simple connected graph in which the degree of every vertex is even, then we can delete any edge from G and it will still be connected.
In: Advanced Math
Sketch the direction field of the equation dy/dx=y-4y^3. Sketch the phase portrait. Find the equilibrium solutions and classify each equilibrium as stable, unstable or semi-stable. Sketch typical solutions of the equation.
In: Advanced Math
3) Laplace Transform and Solving first order Linear Differential Equations with Applications The Laplace transform of a function, transform of a derivative, transform of the second derivative, transform of an integral, table of Laplace transform for simple functions, the inverse Laplace transform, solving first order linear differential equations by the Laplace transform Applications: a)))))) Series RL circuit with ac source [electronics]
In: Advanced Math
Suppose f : X → S and F ⊆ P(S). Show, f −1 (∪A∈F A) = ∪A∈F f −1 (A) f −1 (∩A∈F A) = ∩A∈F f −1 (A)
Show, if A, B ⊆ X, then f(A ∩ B) ⊆ f(A) ∩ f(B). Give an example, if possible, where strict inclusion holds.
Show, if C ⊆ X, then f −1 (f(C)) ⊇ C. Give an example, if possible, where strict inclusion holds.
In: Advanced Math
In: Advanced Math
In: Advanced Math
For any r, s ∈ N, show how to order the numbers 1, 2, . . . , rs so that the resulting sequence has no increasing subsequence of length > r and no decreasing subsequence of length > s.
In: Advanced Math
Many elderly people have purchased medigap insurance policies to cover a growing Medicare copayment. These polices cover some or all of the medical costs not covered by Medicare. use economic theory to explain how these policies likely influence the demand for health care by elderly people.
In: Advanced Math
u=αx + αy
find
slope, graph
convexty
continuity
In: Advanced Math
Let f : X → Y and g : Y → Z be functions. We can define the composition of f and g to be the function g◦ f : X → Z for which the image of each x ∈ X is g(f(x)). That is, plug x into f, then plug theresultinto g (justlikecompositioninalgebraandcalculus). (a) If f and g arebothinjective,must g◦ f beinjective? Explain. (b) If f and g arebothsurjective,must g◦ f besurjective? Explain. (c) Suppose g◦ f isinjective. What,ifanything,canyousayabout f and g? Explain. (d) Suppose g◦f issurjective. What,ifanything,canyousayabout f and g? Explain.
please write clearly
In: Advanced Math
Consider the equation: ?̇ +2? = ?(?) with initial condition x(0) = 2
(a) If u(t) = 0, find the solution ?(?). What is ?(?) as t -> ∞?
(b) If u(t) = 4+t, find the solution ?(?). What is ?(?) as t -> ∞?
(c) If u(t) = ?3?, find the solution ?(?). What is ?(?) as t -> ∞?
(d) If u(t) = δ(t), find the solution ?(?). What is ?(?) as t -> ∞?
In: Advanced Math
In: Advanced Math
For this Variation of parameter problem, consider the following method of solving the general linear equation of first order
y' + p(t)y= g(t)
(a) If g(t) = 0 for all t, show that the solution is
y= Aexp[ - the integral of p(t)dt] , where A is a constant
Please use good handwriting and show as many steps as possible. Thank you.
In: Advanced Math