[Maxima-bugs] [ maxima-Bugs-2149039 ] function is works not correct

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Bugs item #2149039, was opened at 2008-10-06 02:16
Message generated for change (Comment added) made by robert_dodier
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>Category: Lisp Core
Group: None
>Status: Closed
>Resolution: Rejected
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: function is works not correct

Initial Comment:
Maxima 5.16.3

(%i4) is((a-b)/(c-d)=(b-a)/(d-c));
(%o4) false

MuPad, Mathematica and Maple's answers are: true  

for example:

MuPad 4.0.6

is((a-b)/(c-d)=(b-a)/(d-c))
TRUE


wol...@t-...

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>Comment By: Robert Dodier (robert_dodier)
Date: 2008-10-07 21:31

Message:
In Maxima, "=" means literal equality (i.e. same expression) while "equal"
means equivalence (equal value). 

is (equal ((a - b)/(c - d), (b - a)/(d - c)));
 => true

Closing this report as it is not a bug.

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Comment By: Raymond Toy (rtoy)
Date: 2008-10-06 07:22

Message:
I think you want to use equal:

is(equal((a-b)/(c-d), (b-a)/(d-c)) -> true



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