**Changes to IODE Materials**

##### May 5, 2021 Update

**Unit 8**- Fixed typo in student generated exemplar of homework write-up.

**Unit 9**- Added the following text to question 2a in the unit, "After computing a couple of steps by hand, use excel to create a much better approximation using a much smaller step size." It was noted in the teacher materials that, this part of the question can be moved to homework depending on the timing of the lesson.

##### APRIL 2, 2021 Update

**Unit 1**- Rephrased homework question 4c.

**Unit 5**- Clarified initial condition in question 5b.
- Fixed typo on page 5.5.
- Rephrased homework question 1.

**Unit 6**- Phase lines (pages 6.2 and 6.3) have been updated so the circles are dashed circles. This gives instructors the opportunity to discuss the differences between open and closed circles in terms of stability.

##### August 31, 2020 Update

**Unit 3**- Fixed a broken web link.

**August 13, 2020 Update**

**Updates to Homework**- Posted student generated exemplars of homework write-ups for Units 10-12. We are in the process of having these done for all units and are uploading as we get them. We are replacing "solutions" with these "exemplars."

**Unit 10**- Clarified the wording in homework question 8a.

**Unit 11**- Clarified the wording in homework question 6.
- Please note, we still are planning a large overhaul of this unit but that has not happened yet.

**August 9, 2020 Update**

**Updates to Homework**- Posted student generated exemplars of homework write-ups for Units 8-9. We are in the process of having these done for all units and are uploading as we get them. We are replacing "solutions" with these "exemplars."

**Unit 8**- Clarified the wording in homework question 1a to align with the exception in 1c.

##### AUGUST 1, 2020 Update

**Updates to Homework**- Posted student generated exemplars of homework write-ups for Units 5-7. We are in the process of having these done for all units and are uploading as we get them. We are replacing "solutions" with these "exemplars."

**Unit 5**- Fixed a typo in Homework #6. h(2)=3 was changed to h(12)=8 to make the problem mathematically valid.

**July 28, 2020 Update**

**Updates to Homework**- Posted student generated exemplars of homework write-ups for Units 1-4. We are in the process of having these done for all units and are uploading as we get them. We are replacing "solutions" with these "exemplars."

**July 21, 2020 Update**

**IODE.tex**- A timestamp has been added to the cover page that indicates the last time an update was pushed

**Cover Page**- A timestamp has been added to the cover page that indicates the last time an update was pushed

**Unit 1**- Some renumbering of problems occurred to make
*reading with meaning*its own problem. - Two new homework problems (#9 and #10)
- Teacher Materials updated to reflect these changes

- Some renumbering of problems occurred to make
**Unit 2**- One new homework problem (#9)

**Unit 3**- One new homework problem (#7)

**Unit 4**- New classwork problem #5. We took HW #9 and moved the set up part of the different tanks to classwork. The homework is where students solve the four differential equations. HW #9 wording was updated accordingly.
- One new homework problem (#11)
- Teacher Materials updated to reflect these changes

**Unit 5**- Added Problems 3b and 5b
- Removed Problem 6
- Added a sentence before the formal Uniqueness Theorem
- Fixed a typo in the formal Uniqueness Theorem
- Added text about having students use an informal version of the theorem
- Added a new Problem 6
- Problem 7 was previously Problem 8
- Added 3 homework Problems (#6, #7, #8)
- Teacher Materials updated to reflect these changes

**Unit 6**- One new homework problem (#7)

**Unit 7**- Two new homework problems (#10 and #11)

**Unit 8**- One new homework problem (#7)

**Unit 9**- Fixed a few typos
- One new homework problem (#8)

**Unit 10**- Changed
*b*to 2 in problem #7 to connect to changes made in Unit 11 - Added a GeoGebra 3D applet to help in problem #10a
- Added a programmable GeoGebra 3D applet to help in problem #14
- Text was added to HW #8
- One new homework problem (#9)

- Changed
**Unit 11**- Changes are planned for this unit but they did not get pushed in this update

**Unit 12**- One new homework problem (#8)

**Unit 13**- New problem was added about repeated roots (#8). This caused the remaining problems to be renumbered.
- The unit now concludes with a “Putting it All Together” page
- One new homework problem (#10)

**Unit 14**- One new homework problem (#6)

**Unit 15**- We are in the process of adding a unit on Laplace Transform. The unit is not available yet.

**Glossary**- The glossary was split into two, one at the end of first order and one at the end of systems. (Part A and Part B)
- Every unit how ends with a homework problem encouraging students to go to the glossary and read definitions that are relevant to that unit.