Exercise 6 requires using Exercises 4 and 5.
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Exercise 4. Let a be any real number. Prove that the Euclidean translation Ta given by Ta(x, y)(a...
Exercise 3.39. • Given real numbers a, b, and 8, prove that the translation function f:(a,b)...
Exercise 3.39. • Given real numbers a, b, and 8, prove that the translation function f:(a,b) → (a +8,6+8) f(x) = x + 8 is a homeomorphism. • Given real numbers a, b, and a positive real number 8, prove that the scaling function g: (a, b) (8.a,8.6) f(x) = 8 x is a homeomorphism.
[9] Given any two real numbers x and y such that x < y, show that...
[9] Given any two real numbers x and y such that x < y, show that there exists a rational number q such that x < a <y.
Show if y y(x) is a solution to an autonomous differential equation y' - f(y), then so is any "horizontal translation" of y. That is, show for any real number C, the function yc(x) - y(x...
Show if y y(x) is a solution to an autonomous differential equation y' - f(y), then so is any "horizontal translation" of y. That is, show for any real number C, the function yc(x) - y(x C) is also a solution to y'-f . y). Of course, y and yc may have possibly different initial conditions
Show if y y(x) is a solution to an autonomous differential equation y' - f(y), then so is any "horizontal translation" of y. That...
.3. Let A and B be distinct points. Prove that for each real number r E (-00, oo) there is exactl...
.3. Let A and B be distinct points. Prove that for each real number r E (-00, oo) there is exactly one point on the extended line AB such that AX/XB- r. Which point on AB does not correspond to any real number r? 4. Draw an example of a triangle in the extended Euclidean plane that has one ideal vertex. Is there a triangle in the extended plane that has two ideal vertices? Could there be a triangle with...
Problem 2: For any x, y e R let d(x,y):-arctan(y) - arctan(x). Do the following: (1) Prove that d...
Problem 2: For any x, y e R let d(x,y):-arctan(y) - arctan(x). Do the following: (1) Prove that d is a metric on R. (2) Letting xnn, prove that {xnJnE is a Cauchy sequence with no limit in R (Note that {xn)nen is NOT Cauchy under the Euclidean metric and that all Cauchy sequences in the Euclidean metric have a limit in R.)
Problem 2: For any x, y e R let d(x,y):-arctan(y) - arctan(x). Do the following: (1) Prove...
Number Theory 13 and 14 please! 13)) Let n E N, and let ā, x, y E Zn. Prove that if ā + x = ā + y, then x-y. 14. In this exercise, you will prove that the additive inverse of any element of Z, is uni...
Number Theory
13 and 14 please!
13)) Let n E N, and let ā, x, y E Zn. Prove that if ā + x = ā + y, then x-y. 14. In this exercise, you will prove that the additive inverse of any element of Z, is unique. (In fact, this is true not only in Z, but in any ring, as we prove in the Appendix on the Student Companion Website.) Let n E N, and let aE Z...
Problem 5. Let n N. The goal of this problem is to show that if two real n x n matrices are simil...
Problem 5. Let n N. The goal of this problem is to show that if two real n x n matrices are similar over C, then they are also similar over IK (a) Prove that for all X, y є Rnxn, the function f(t) det (X + ty) is a polynomial in t. (b) Prove that if X and Y are real n × n matrices such that X + ừ is an invertible complex matrix, then there exists a...
Prove that for any two real numbers x and y, |x + y| ≤ |x| +...
Prove that for any two real numbers x and y, |x + y| ≤ |x| + |y|. Hint: Use the previously proven facts that for any real number a, |a|≥ a and |a|≥−a. You should need only two cases.
A 13. Let X be a p-element set and let Y be a k-element set. Prove that the number of functions f :X >Y which map X...
A 13. Let X be a p-element set and let Y be a k-element set. Prove that the number of functions f :X >Y which map X onto Y equals k!S(p, k) S#(p, k) :
A 13. Let X be a p-element set and let Y be a k-element set. Prove that the number of functions f :X >Y which map X onto Y equals k!S(p, k) S#(p, k) :
Let A C R and fA: R2-given by 1 if (x, y) E A 0 if...
Let A C R and fA: R2-given by 1 if (x, y) E A 0 if (r, y) A Ar, y): a)Prove that fAis continuosin int(A)Uert(A) and f is dicontinuos in cl(A) b)Draw fA a) A = B2 (0) . b) A = {(x,y) | xy = 0} . c) A = {(z, y) | y E Q)
Exercise 3.39. • Given real numbers a, b, and 8, prove that the translation function f:(a,b) → (a +8,6+8) f(x) = x + 8 is a homeomorphism. • Given real numbers a, b, and a positive real number 8, prove that the scaling function g: (a, b) (8.a,8.6) f(x) = 8 x is a homeomorphism.
[9] Given any two real numbers x and y such that x < y, show that there exists a rational number q such that x < a <y.
Show if y y(x) is a solution to an autonomous differential equation y' - f(y), then so is any "horizontal translation" of y. That is, show for any real number C, the function yc(x) - y(x C) is also a solution to y'-f . y). Of course, y and yc may have possibly different initial conditions
Show if y y(x) is a solution to an autonomous differential equation y' - f(y), then so is any "horizontal translation" of y. That...
.3. Let A and B be distinct points. Prove that for each real number r E (-00, oo) there is exactly one point on the extended line AB such that AX/XB- r. Which point on AB does not correspond to any real number r? 4. Draw an example of a triangle in the extended Euclidean plane that has one ideal vertex. Is there a triangle in the extended plane that has two ideal vertices? Could there be a triangle with...
Problem 2: For any x, y e R let d(x,y):-arctan(y) - arctan(x). Do the following: (1) Prove that d is a metric on R. (2) Letting xnn, prove that {xnJnE is a Cauchy sequence with no limit in R (Note that {xn)nen is NOT Cauchy under the Euclidean metric and that all Cauchy sequences in the Euclidean metric have a limit in R.)
Problem 2: For any x, y e R let d(x,y):-arctan(y) - arctan(x). Do the following: (1) Prove...
Number Theory
13 and 14 please!
13)) Let n E N, and let ā, x, y E Zn. Prove that if ā + x = ā + y, then x-y. 14. In this exercise, you will prove that the additive inverse of any element of Z, is unique. (In fact, this is true not only in Z, but in any ring, as we prove in the Appendix on the Student Companion Website.) Let n E N, and let aE Z...
Problem 5. Let n N. The goal of this problem is to show that if two real n x n matrices are similar over C, then they are also similar over IK (a) Prove that for all X, y є Rnxn, the function f(t) det (X + ty) is a polynomial in t. (b) Prove that if X and Y are real n × n matrices such that X + ừ is an invertible complex matrix, then there exists a...
A 13. Let X be a p-element set and let Y be a k-element set. Prove that the number of functions f :X >Y which map X onto Y equals k!S(p, k) S#(p, k) :
A 13. Let X be a p-element set and let Y be a k-element set. Prove that the number of functions f :X >Y which map X onto Y equals k!S(p, k) S#(p, k) :
Let A C R and fA: R2-given by 1 if (x, y) E A 0 if (r, y) A Ar, y): a)Prove that fAis continuosin int(A)Uert(A) and f is dicontinuos in cl(A) b)Draw fA a) A = B2 (0) . b) A = {(x,y) | xy = 0} . c) A = {(z, y) | y E Q)
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