On Friday, March 16, 2018 at 7:29:30 PM UTC-7, A. Jorge Garcia wrote:
>
> Thanks!
>
> On Fri, Mar 16, 2018, 10:27 PM Andrey Novoseltsev <novo...@gmail.com
> <javascript:>> wrote:
>
>> On Fri, Mar 16, 2018 at 4:18 PM, Jorge Garcia <calc...@gmail.com
>> <javascript:>> wrote:
>> > Dear Hive Mind:
>> >
>> > 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 someone 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=eJwljkFrg0AUhO-C_2GKKbhW0t1LLmUvwddmLxq2EtKWBKTZWkGeYjX5-3XjbXgz37yJkJmDyQjbD3ySLUDWFhav5kjZQxhE6KVeKSllCqs3jylGrcKgj1lof01i9STXcvPM4swvf7_dLfae8GTt2A3V6NBwP43Ii3JW3-10abgGaxkGuR4qrl2sUiXFQud31F2rdvKoL0OSJDuyBFMiK-gdb-ZAKHe0bJ3dMNjrr3v0pxvA8xvkp6VvL_4B6uc8qg==&lang=sage
>> >
>> > Thanx,
>> > AJG
>>
>> Someone probably can, but perhaps not on this list: it has something
>> to do with 0^0 evaluating to 1 and I recall some earlier discussions
>> about it. Forwarding to sage-support.
>>
>
Maybe related to this:
sage: 2/0
---------------------------------------------------------------------------
ZeroDivisionError Traceback (most recent call last)
<ipython-input-72-38bb5ffd9469> in <module>()
----> 1 Integer(2)/Integer(0)
/Users/palmieri/Desktop/Sage_stuff/sage_builds/VANILLA/sage-8.2.beta8/local/lib/python2.7/site-packages/sage/rings/integer.pyx
in sage.rings.integer.Integer.__div__
(build/cythonized/sage/rings/integer.c:13231)()
1910 if type(left) is type(right):
1911 if mpz_sgn((<Integer>right).value) == 0:
-> 1912 raise ZeroDivisionError("rational division by zero")
1913 x = <Rational> Rational.__new__(Rational)
1914 mpq_div_zz(x.value, (<Integer>left).value,
(<Integer>right).value)
ZeroDivisionError: rational division by zero
sage: 2.0/0
+infinity
I don't like this behavior much. What is the rationale? In inexact rings,
zero division is not a thing?
--
John
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