Comment #48 on issue 821 by pr...@goodok.ru: multiple arguments for max and
other improvements
http://code.google.com/p/sympy/issues/detail?id=821
I will play with this function on week-end further to examine all questions
and code design more.
About the last Vinzent's question. It is interesting, on the one hand we
came to conclusion that this function must raise exception even in the case
when only one argument is complex number e.g. `Max(I)`. On the other hand
we assume that symbols (therefore some functions from them like `sin(x)`)
are in complex field by default. But I confused how it related with
`x.is_complex==None`. One may say that for this case it is not straightly
defined that 'x' is now complex indeed, but only admitted that it can.
So it is a question what to do rightly.
Offhand, it can be:
- strictly follow the assumption core, and do not permit use variables
which we are not sure with (x.is_complex==None).
- or work with them, considering that assumptions are not defined (one may
say that assumptions are symbolic variables too)
So I intend to the second variant also.
But this behaviour must be clear described, and not only for Max but for
the assumions module too (if it is not already).
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