## Protected: Exam 3, Feedback and Solutions

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Dear all, Exam 3 will take place next Wednesday 4/8. It covers all problems from Exam 1, Exam 2, and the homework assignments after Exam 2. In particular, it covers the homework assignments due on: 3/18, 3/25, and 4/1. For solutions to Exam 1 and Exam 2 see: https://udmmath3720w15.wordpress.com/2015/02/11/exam-1-feedback-and-solutions/ https://udmmath3720w15.wordpress.com/2015/03/17/exam-2-feedback-and-solutions/ If you have any questions, […]Read Post ›

Dear all, For next week’s homework you will have to compute some partial fractions decompositions. You can either compute it “by hand” or using Sage. For partial fractions decomposition in Sage, see: https://cloud.sagemath.com/projects/a9485699-5a52-4004-bf4b-d35f796dcedf/files/Partial%20Fractions%20Decomposition.sagews (You may have to copy and paste both lines into your browser.) If you use Sage, please email your worksheets to the […]Read Post ›

Dear all, For the problems that ask for the Laplace transform, you can use Sage to check your answers. See https://cloud.sagemath.com/projects/a9485699-5a52-4004-bf4b-d35f796dcedf/files/Laplace%20Transform.sagews Using Sage does not substitute your work. You still have to compute the Laplace transform (integrating, taking limits etc.) but you can use Sage to check if your work is correct.

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Feedback for Exam 2- MTH 3720- W15 Problem 1. The equation is exact, not separable. If you try to solve as if it were separable, it does not work. Problem 4. The eigenvalues are complex numbers. If the eigenvalue is -1+2i and the eigenvector is (1,i), then the solution in e^(-1+2i)*(1,i).

There are the examples we started today in class: https://cloud.sagemath.com/projects/a9485699-5a52-4004-bf4b-d35f796dcedf/files/Examples%20of%20Vector%20Fields%20for%20Systems%20of%20Diff.%20Eq..sagews (You may have to copy and paste the whole address to your browser).

Dear all, Exam 2 will take place on Tuesday after the break, 3/10. It covers all the problems from Exam 1 (see Exam 1 and Solutions at https://udmmath3720w15.wordpress.com/2015/02/11/exam-1-feedback-and-solutions/) and the homework assignments between Exam 1 (2/4) and yesterday (2/25). The exam problems will be variations of Exam 1 and homework problems. So, please review these […]Read Post ›

Use the following worksheet: https://cloud.sagemath.com/projects/a9485699-5a52-4004-bf4b-d35f796dcedf/files/Numerical%20Methods%20for%20Systems%20of%20First%20Order%20Diff.%20Equations.sagews (The address is very long. You may have to copy and paste it to the address bar, instead of just clicking on it).

You can find the examples from section 3.3 “Homogeneous Linear Systems with Constant Coefficients” in the following address: https://cloud.sagemath.com/projects/a9485699-5a52-4004-bf4b-d35f796dcedf/files/Homogeneous Linear Systems with Constant Coefficients.sagews (You may have to copy and paste the whole address into your browser. Just clicking on it may not work).