Differential equations Unit 20 start

This is the first part of Unit 20 on Differential equations [PDF]. Please switch the resolution to 4K (2160 pixel under settings when hitting the wheel right below). When seen in full screen, one can see things well.

Swiss bear was doing the camera. Click for a large picture.

Thursday, 3/14/2019 was not only Pi day but also housing day at Harvard preventing most of the class to see the lecture. I recorded therefore with a new GoPro camera 7 and could test the 4K/60 FPS resolution. For some reason, the camera stopped recording around 40 minutes. Others have seen the problem too and recommend to reformat the SD card first inside the camera. (Indeed, I used a brand new 64 gig card for this recording which was not reformatted within the camera). The camera also got a firmware update the night before to be able to record in the 4K/60 mode. In that resolution, the SD card should be able to record 2 hours.