Re: False result with Integrate ?

*To*: mathgroup at smc.vnet.net*Subject*: [mg8744] Re: [mg8711] False result with Integrate ?*From*: "Sherman.Reed" <sherman.reed at worldnet.att.net>*Date*: Sat, 20 Sep 1997 22:28:10 -0400*Sender*: owner-wri-mathgroup at wolfram.com

Giles, First plot the function using plotted. I assume you want to calculate the area from the xy plane to the curve. Second, consider the following integral Integrate[Integrate[x,{x,y,1}],{y,0,1}], which when evaluated in 2.2, 3.0, 2.2.3 gives the exact result of 1/3 Sherman C. Reed sherman.reed at worldnet.att.net ---------- > From: Gilles BARBIER <Gilles.Barbier at der.edfgdf.fr> To: mathgroup at smc.vnet.net > To: mathgroup at smc.vnet.net > Subject: [mg8744] [mg8711] False result with Integrate ? > Date: Friday, September 19, 1997 1:47 AM > > > Help ! > > Why : Integrate[Integrate[ Sqrt[(x-y)^2],{x,0,1}],{y,0,1}] > gives 0 with math2.2 or math3.0. > > The exact result is 1/3 !! > > Gilles > EDF/DER