# Search results

1. ### Fermat's Last Theorem related question

Homework Statement Show that x^{n}+y^{n}=z^{n} has a nontrivial solution if and only if the equation \frac{1}{x^{n}}+\frac{1}{y^{n}}=\frac{1}{z^{n}} has a nontrivial solution. Homework Equations By nontrivial solutions, it is implied that they are integer solutions. The Attempt at a Solution...
2. ### Prove that every non-zero vector in V is a maximal vector

Homework Statement Let V be a finite dimensional vector space and T is an operator on V. Assume μ_{T}(x) is an irreducible polynomial. Prove that every non-zero vector in V is a maximal vector. Homework Equations μ_{T}(x) is the minimal polynomial on V with respect to T. The Attempt at...
3. ### Vector Spaces and Correspondence

I think I get it now. The function maps the coset of V mod U to the same coset of V mod U by mapping each individual element to another element in that coset. I'm sorry if it seemed I brushed over your post and didn't completely read it. I did. I just didn't understand it. I'm having trouble...
4. ### Vector Spaces and Correspondence

This is where I confuse myself. T is a linear transformation from V to V. If it maps the set v+U to the set v+U, then wouldn't that be mapping cosets of V mod U to cosets of V mod U instead of mapping V to V?
5. ### Vector Spaces and Correspondence

Homework Statement This question came out of a section on Correspondence and Isomorphism Theorems Let V be a vector space and U \neq V, \left\{ \vec{0} \right\} be a subspace of V. Assume T \in L(V,V) satisfies the following: a) T(\vec{u} ) = \vec{u} for all \vec{u} \in U b) T(\vec{v} + U) =...
6. ### Isomorphic Vector Spaces Proof

Thank you so much for your help!
7. ### Isomorphic Vector Spaces Proof

What I take away from the First Isomorphism Theorem is that if two vectors \vec{v}, \vec{u} \in V, then for any Linear transformation T:V\rightarrow W, if T(\vec{u}) = T(\vec{v}) then \vec{u} \equiv \vec{v} modulus Ker(T) So if you only take the cosets of V mod Ker(T), then it follows that...
8. ### Isomorphic Vector Spaces Proof

We went over all three of those. I don't fully understand them, though. I think that's my main problem. I went back to basis because I was familiar with that. It is "the collection of cosets of V modulo Ker(f)". I quoted that from the book because I would have gotten that wrong. I understand...
9. ### Isomorphic Vector Spaces Proof

Homework Statement Let V be a vector space over the field F and consider F to be a vector space over F in dimension one. Let f \in L(V,F), f \neq \vec{0}_{V\rightarrow F}. Prove that V/Ker(f) is isomorphic to F as a vector space. Homework Equations L(V,F) is the set of all linear maps...
10. ### Sum of this geometric sequence doesn't make sense!

The sum of a geometric series is defined as: a+ar+ar^2+ar^3+...+ar^{n-1} = a\frac{1-r^n}{1-r} If n started at 0, then a would be 2. Since n starts at 1, in order to form a geometric series we must group it as following: \frac{8}{3} + \frac{8}{3}(\frac{4}{3}) + \frac{8}{3}(\frac{4}{3})^2 +...
11. ### Sum of this geometric sequence doesn't make sense!

I'm assuming that second 2 is a typo and should be an n. \sum ^{14}_{n=1} 2(\frac{4}{3})^n I believe the equation is working. a represents the first term in the series. In this case, what is a?
12. ### Proof involving Rank Nullity Theorem

I just fixed a pretty bad typo my self. Mine should be correct now.
13. ### Proof involving Rank Nullity Theorem

If Kernel(T)=Kernel(T^2), then Range(T)=Range(T^2) First I started by saying that Kernel(T) = Kernel(T^2) \Rightarrow Nullity(T) = Nullity(T^2) By the Rank Nullity Theorem we have the following: Dim(V) = Rank(T) + Nullity(T) Dim(V) = Rank(T^2) + Nullity(T^2) \Rightarrow Rank(T) +...
14. ### Proof involving Rank Nullity Theorem

Thank makes sense! Then it follows that since \text{ker}(T) \subset \text{ker}(T^2) and Nullity(T)=Nullity(T^2) then \text{ker}(T) = \text{ker}(T^2) Since the Kernel is, by definition, a subspace of V. And if a Vector Space with dimension n is contained in another Vector Space with...
15. ### Proof involving Rank Nullity Theorem

Ah, ok. I think that makes sense. Thanks! Ooh. I didn't understand that operator on V implied T:V->V. Does being an operator imply that it is a linear transformation? Or is that part just assumed in the problem? Ok. So trying that I get T^2(c_{1}\vec{v_{1}}+c_{2}\vec{v_{2}}) =...
16. ### Proof involving Rank Nullity Theorem

I hope I'm posting this in the right place. Homework Statement Let V be a finite dimensional vector space over a field F and T an operator on V. Prove that Range(T^{2}) = Range(T) if and only if Ker(T^{2}) = Ker(T) Homework Equations Rank and Nullity theorem: dim(V) = rank(T) +...
17. ### Order by asymptotic growth rate

Edit: Nevermind. Now I'm curious though. I might just be going out on a limb here, but I think that looking at it from this perspective might help: By the definition of logarithm, log_{10}n = x implies n = 10^x I hope it helps at least
18. ### Comp Sci Python highest prime factor problem.

Edit: Oops, didn't realize someone posted before me. There's a while loop there that you forgot to reinitialize :wink:
19. ### Instantaneous velocity from avg velocity with constant accelartion

It can be shown this way I believe. Here's a hint: Vavg= (Vi + Vf)/2 Vavg= (Vi + Vf)/2 - Vi +Vi Vavg= (Vf - Vi)/2 +Vi
20. ### Fairly basic statistics help

I think the best way to approach this problem is to visual what the problem is asking for. What is the region under the Normal Curve that it wants? In this case, the symmetry could be of use to you.
21. ### Programming Help

This still won't work. ceil(rand*5) will only produce integers 1-5. In your 2nd while loop, shouldn't that only be counting the number of times each die has rolled? It seems like your 2nd while loop encompasses much more than you want it to. In your program you set the counters d1-d6 to zero...
22. ### Calculating velocity, time, and Instantaneous speed using kinematic equations

Velocity is a vector. Since the velocity is downwards, it is negative. When you took the square root to solve for the final velocity, you wrote + instead of +/-

That's right, and I believe your math is correct too. Since all three sides of the triangles are congruent: \overline{DB}\cong\overline{DC} given \overline{BA}\cong\overline{AC} because they are the same length \overline{AD}\cong\overline{AD} trivial, they share a common line Then the...
24. ### Calculating velocity, time, and Instantaneous speed using kinematic equations

The acceleration of gravity on Earth is always -9.81m/s^2. An object speeding at 3000m/s towards the ground will feel the same -9.81m/s^2 acceleration as an object that has just been dropped. In reality, an object going at 3000m/s might be slowing down if the air resistance is large enough, but...

Hint: What is the relation between the angles DAB and DAC?
26. ### Calculating velocity, time, and Instantaneous speed using kinematic equations

If the stones are thrown vertically downward, you can think of the angle being 90° (the angle between the positive x-axis and the negative y-axis). The horizontal component of the velocity (magnitude*cos90) = 0 and the vertical component of the velocity (magnitude*sin90) is just the original...
27. ### Logic gates - Electronics

The simplification in the equation could have also been obtained by grouping the four corners on the Karnaugh map instead of just boxes 0 and 8. I didn't see anyone else mention it, so I thought I would throw that out there :smile:
28. ### Converting polar to cartesian coordinates

The 2 comes from the symmetry. 0 to pi/4 on the sine circle is only calculating the bottom-right half of the area.
29. ### Programming Help

This will not generate a fair die. The quantity rand*5+1 will produce a number in the range 1-6. It sounds like it would be fair, but rounding the number will produce the following results: 1 (1 <= x < 1.5) - 10% of the time 2 (1.5 <= x < 2.5) - 20% of the time 3 (2.5 <= x < 3.5) - 20%...
30. ### Need Help on Energy Homework! Please!

The Kinetic Energy is equal to the work that the friction force must do to stop the box. Since W=Fd, the distance that box travels is d=W/F. So yes, you did it correctly.