When I try the following:
sage: x,y = var('x,y')
sage: region_plot(1/x + 1/y > 1/x * 1/y, (x,-10,10), (y,-10,10)).show
()
I get an error (the last line of the Traceback is reproduced below):
TypeError: reduce() of empty sequence with no initial value
This error occurs in both the notebook and at the Sage prompt. I found
this in versions 4.1.2 to 4.3, but I don't know about the versions
before 4.1.2.
Interestingly, the following commands work:
sage: region_plot(1/x + 1/y < 1/x * 1/y, (x,-10,10), (y,-10,10)).show
() # '>' changed to '<'
sage: implicit_plot(1/x + 1/y == 1/x * 1/y, (x,-10,10),
(y,-10,10)).show()
I'm not very proficient at using Sage, so I appreciate any ideas and
advice.
Tianwei
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