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}.)
In: Advanced Math
C. Prove the following claim, using proof by induction. Show your work.
Let d be the day you were born plus 7 (e.g., if you were born on March 24, d = 24 + 7). If a = 2d + 1 and b = d + 1, then an – b is divisible by d for all natural numbers n.
In: Advanced Math
In: Advanced Math
Prove for the system of ordinary differential equations x'=-x, and y'=-5y the origin is lyapunov stable, attracting and asymptotically stable using the EPSILON DELTA definition of each. The epsilon and delta that make the definitions hold must be found.
In: Advanced Math
Determine if a real-world system could be represented as a particle
Please give a exemple
In: Advanced Math
7) (a) (2 pts) How many permutations are there of the word QUARANTINE?
(b) (4 pts) How many of the permutations of QUARANTINE do NOT the same letter appearing consecutively? (Thus, any permutation with the substring "AA" should not be counted and any permutation with the substring "NN" should not be counted.)
(c) (6 pts) A mountain permutation is defined as one where the first portion of the permutation has letters in strictly increasing alphabetical order, and the second portion with the letters in strictly decreasing alphabetical order. One mountain permutations of the letters in QUARANTINE is AINTURQNEA. Notice that only a set of letters with a unique "maximum" alphabetic letter have mountain permutations. For this permutation, A < I < N < T < U, and U > R > Q > N > E > A. How many mountain permutations are there of the letters in the word QUARANTINE?
In: Advanced Math
Match each sequence to a good candidate for a closed form. Note that for each of the given sequences, the initial value of the index n is given.
selectABCDE | 1.
f(n)=5n−2 |
selectABCDE | 2.
f(n)=((1+5√)2)n−((1−5√)2)n5–√ |
selectABCDE | 3.
f(n)=2n+1−1 |
selectABCDE | 4.
f(n)=5n+3 |
selectABCDE | 5.
f(n)=2n−1 |
selectABCDE | 6.
f(n)=(n+1)2−1 |
selectABCDE | 7.
f(n)=n2−1 |
In: Advanced Math
p(x) = a0 + a1x + a2x2 + · · · + akxk is a polynomial of degree k. What is the Taylor series of p(x), and its radius and interval of convergence.
In: Advanced Math
(a) Construct the consumption matrix C for this model.
(b) Compute the matrix (I – C) 1.
(c) Find the equilibrium production level when the final demand is d = (10, 40).
(d) Also compute the equilibrium production levels for final demands (1, 0) and (11, 40).
(f) In light of your answers to parts (c), (d), and (e) above, interpret the entries in
the matrix (I – C) 1.
(g) Suppose that due to the growth of green energy companies, the energy sector requires only 0.3 million dollars of input from the mining sector. Compute the new consumption matrix C* and then new (I – C*) 1. Interpret the entries of the inverse matrix and compare to your answer to part (f) to explain how the change in the energy sector will affect this economy. .
det(A-1 ) = 1/ det(A)
In: Advanced Math
Prove
1. Let f : A→ B and g : B → C . If g 。 f is one-to-one, then f is one-to-one.
2. Equivalence of sets is an equivalence relation (you may use other theorems without stating them for this one).
In: Advanced Math
x"(t)- 4x'(t)+4x(t)=4e^2t ; x(0)= -1, x'(0)= -4
In: Advanced Math
Graph theory
In a certain school, there are 39 clubs and 194 students. Some students do not belong to any clubs but every club has at least one member and no two clubs have the same number of members. Prove that there is a way to choose one student from each club ending up with 39 different students.
In: Advanced Math
find the general solution of the given differential equation.
1. y''+2y'−3y=0
2. 6y''−y'−y=0
3. y''+5y' =0
4. y''−9y'+9y=0
In: Advanced Math
Given that a particular solution of 2y′′ +3y′ +y = x^2 +7x+8 is yp1=x^2+x+1 and that a particular solution of 2y′′ + 3y′ + y = 2sinx+4cosx is yp2=sinx-cosx, find a particular solution for 2y" +3y' +y =3x^2 + 21x + 24 -sinx -2cosx
In: Advanced Math
can a vector with dimensions R^N and a vector with dimensions R^N+1 be a matrix? and if so what would it dimension size be?
In: Advanced Math