From: SourceForge.net <noreply@so...>  20030927 17:58:57

Bugs item #812968, was opened at 20030926 05:29 Message generated for change (Comment added) made by macrakis You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=812968&group_id=4933 Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Joel Ray Holveck (piquan) Assigned to: Nobody/Anonymous (nobody) Summary: is(equal(...)) says unknown, ratsimp says 0 Initial Comment: The way I understood EQUAL, it seems that it's supposed to answer true if ratsimp returns true. But in the following equation, it is clear that this is not happening. Sorry about the mess; this was the simplest reproduction scenario I could find. (C112) is(equal(x/(2*x*sqrt(2))  1/(2*x*sqrt(2)), (x1)/(2*x*sqrt(2)))); (D112) UNKNOWN (C113) is(equal(x/(2*x*sqrt(2))  1/(2*x*sqrt(2)), (x)/(2*x*sqrt(2))1/(2*x*sqrt(2)))); (D113) TRUE (C114) ratsimp(x/(2*x*sqrt(2))  1/(2*x*sqrt(2))  (x1)/(2*x*sqrt(2))); (D114) 0 (C115) facts(); (D115) [NOT EQUAL(x, 0)] I did consider that the problem may be related to the fact that ratsimp simplifies the two sides of the equation differently, so I tried putting them on the same side. In the following, the left side of the equal ratsimp's to 0 (as seen in D114), and yet equal doesn't assert that it's equal to 0. (C130) is(equal(x/(2*x*sqrt(2))  1/(2*x*sqrt(2))  (x1)/(2*x*sqrt(2)), 0)); (D130) UNKNOWN I may be missing something obvious here I'm just learning Maxima but this seems off to me.  >Comment By: Stavros Macrakis (macrakis) Date: 20030927 13:58 Message: Logged In: YES user_id=588346 You are absolutely right: this is a bug. Worse, is(equal(1/sqrt(2),sqrt(2)/2)) and even is(equal(1/sqrt (2)sqrt(2)/2,0)) return False! As you say, it should be using ratsimp(1/sqrt(2)sqrt(2)/2)  which does correctly return 0. It is also a known problem (bug?) that 1/sqrt(2) and sqrt(2)/2 do not simplify to the same thing, but as you say, even when you put them on the same side, it doesn't work.... 5.9.0 gcl 2.5.0 W2k  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=812968&group_id=4933 