Where's the Divide By Zero Error?

[Jorge Garcia]

Why is there no Divide By Zero Error here:

http://sagecell.sagemath.org/?z=eJwljkELgkAUhO-C_2GiAtek1kuX2Eu4pBc3NjEqCqQ2E-QlpvX3cwuGd5jHzDdjZHGyw6BUZdgoFQXYx1JLa2WxRJTkSSSxPuAotYLUWumR64zRcDEJOecBtFhOA3QitHZpyLRFZ1BR03fDvdb9raISJLjrpKItqDReyNnq9Xh-vJTZkHkXdW9DjUcMvu__F2SIlNxhk-Tyt-UHH76usxUny_a9cMbnfLkgdiHcny1oICI9_8u37AuZcDtw&lang=sage

But there is a Divide By Zero Error here (as expected):

http://sagecell.sagemath.org/?z=eJwlj0FLw0AQhe-B_IcnVcimQTeXXmQPtRnsXrJhG6q2WAh2GwtlGmKif9_dBoY5zJvvzZsZ6rXewNerMUWGNwK9V7SqsUSht7ogvHxgR9aArDX2Lo5m6KS6z6WUGaxaPGQYVB5HXcJChWma5HP5KBdPLA78_PN9_UuCJgLZOnZ9MzicuRsH378u4_HMLVjJOCpV33DrklyKiStvkPttLmOAgg3SNF2TJegahSGfW2_JP0FTPq_GUaX2t9XTtQf7Iyg_J79K_AMYbUA7&lang=sage

Can soeone please explain this to me? This came up in class and I was looking for a "teachable moment" asking the students to fix the Divide By Zero Error like this:

http://sagecell.sagemath.org/?z=eJwlj81qwzAQhO8Gv8OUtGA5ppUuuRQd2nhpdLGMYtI_WjCN4gbCxrh2-_qVYlj2sLPf7OwCzcZsEerJ2rLAM4Fealo3eEBpdqYkPL7ijZwFOWfdVZos0Et9raSUBZxe3RQYtUqTPmOh4zTP1FLeytUdi0--__k-_2VRE5HsPPuhHT2O3E9j6F-naX_kDqxlmlR6aLnzmSqUFDNZXTD_256miEUj5Hm-IUcwDUpLIbnZUXiD5oRBTZNav19WD-cBHM6g-pj9avEPiLZAmA==&lang=sage

TIA,

AJG

[Jorge Garcia]

OOPS, last link should have been:

http://sagecell.sagemath.org/?z=eJwljk9rg0AUxO-C32GCKbhW0t2Ll7CX4GuzFw3bIPlDC5JsrRBexGr79evGyxzezG_eRMhNZXLC5ogT2RJkbWnxag6UL8IgQif1UkkpU1idPaUYtAqDLmah_TWJ1bNcyeyFxSevf77vf7H3hCcbx66vB4eWu3GY9HIbry03YC3DoNB9zY2LVaqkmMnigbnf-jZ6zBchSZItWYLZIy_pHW-mIuy3NO-c3DDY6fMj-nXvwdMbFB9z3078AwEmO5k=&lang=sage

[Jorge Garcia]

Sorry, this is REALLY the last link!

http://sagecell.sagemath.org/?z=eJwljkFrg0AUhO-C_2GKKbhW0t1LLmUvwddmLxq2EtKWBKTZWkGeYjX5-3XjbXgz37yJkJmDyQjbD3ySLUDWFhav5kjZQxhE6KVeKSllCqs3jylGrcKgj1lof01i9STXcvPM4swvf7_dLfae8GTt2A3V6NBwP43Ii3JW3-10abgGaxkGuR4qrl2sUiXFQud31F2rdvKoL0OSJDuyBFMiK-gdb-ZAKHe0bJ3dMNjrr3v0pxvA8xvkp6VvL_4B6uc8qg==&lang=sage

On Friday, March 16, 2018 at 1:34:27 PM UTC-4, Jorge Garcia wrote: