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Incorrect result of is with abs and infinity

Posted on 2008-08-23 15:52 By djc (Maple Rating 1 67)
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Hello!

I have just found this incorrect behaviour of is  (Maple 12):

restart;

is(abs(y)<infinity); # It's not OK.
                                 true

is(y<infinity); # it's OK.
                                false

I'll submit it. 

 

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y might not be real

Comment on 2008-08-23 16:14 from Alex Smith (Maple Rating 3 300)

It's not a bug. The point is that y might be complex.

See how this works:

assume(y,real);

is(y<infinity);

 true

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