# Month: January 2015

## Homework Due 2/4

The homework this week will be very short because of Exam 1: Section 2.4, Problems 4, 7, 17

## Past Due Homework Assignments

Dear all, As we said in class, the assignments that were due on 1/21 and 1/28 (yesterday), you can submit again by Wednesday 2/4 for half credit. There will be another assignment due next week, rather short because of Exam 1. Watch WordPress for this.

## Exam 1

Dear all Exam 1 will take place next Wednesday 2/4. It covers all homework assignments past due, including the homework assignment that you turned in today. The exam problems will be variations of the homework problems. So, please review all homework problems again. If you have any questions, please ask on Tuesday in class.

## Feedback for Homework Due 1/21

Differential Equations- Winter 2015 Feedback for HW Due 1/21 Approximately 3 problems will be graded each week. The more problems you try, the higher the chances you will have solved the selected 3. Your paper homework is graded on the method you use, not the answer. Correct steps, but wrong answer, can yield full points. […]Read Post ›

## 2.3 Problem 20

Professor: I am having trouble with problem 20 in section 2.3. I believe I have made the direction field correctly on Sage, but I do not know how to solve the equation to get the implicit solution. Since I do not know how to plot the function on Sage if I do not have the […]Read Post ›

## Sage Worksheet- Autonomous Differential Equations

You can find examples of direction fields for the 4 autonomous differential equations we talked about in class in the following address: https://cloud.sagemath.com/projects/f5b7a777-6403-4ac0-9e31-c05560601eda/files/Autonomous%20Differential%20Equations.sagews There is one example for each category: Exponential Growth, Logistic Growth, Critical Threshold, Logistic Growth with Critical Threshold.

## Homework Due on Wednesday 1/28

Please submit your paper solutions to the instructor by Wednesday 1/28 at the beginning of class. If any problem requires you to use Sage, please submit your worksheets to the instructor by Wednesday 1/28 at 9:00am. See instructions on https://udmmath3720w15.wordpress.com/2015/01/21/submit-sage-worksheets/ Worksheets must be named by your last name followed by the due date. E.g. Souldatos-0128.sagews. […]Read Post ›

## Sage Worksheets “Separable Differential Equations” and “Euler’s Method”

Dear all, 1) I introduced some comments on the Sage worksheet “Separable Differential Equations” to help you understand the commands in each cell. You can access the new worksheet at cloud.sagemath.org: https://cloud.sagemath.com/projects/a62de059-5442-4285-bca1-ad714c016830/files/Separable%20Differential%20Equations-%20MTH%203720.sagews or download from Dropbox: https://www.dropbox.com/s/vy5l8hh25eul1ra/Separable%20Differential%20Equations-%20MTH%203720.sagews?dl=0 2) The Euler’s Method.sagews can be accessed at https://cloud.sagemath.com/projects/a62de059-5442-4285-bca1-ad714c016830/files/Euler%27s%20Method.sagews You only need the commands in the first cell. […]Read Post ›

## Submit Sage Worksheets

Dear all, 1) Instead of printing the Sage worksheets, you can send them to me by email. IMPORTANT: Before you send your worksheets, please rename them as “YourLastName-Deadline.sws”. E.g. Souldatos0121.sws, or Souldatos0121.sagews. Files that are not named following the above convention will be rejected. 1st way (easiest): I am assuming you are working on https://cloud.sagemath.com/ […]Read Post ›