Re: Integration of expressions with symbolic limits

*To*: mathgroup at smc.vnet.net*Subject*: [mg127432] Re: Integration of expressions with symbolic limits*From*: "Harker, Anthony" <a.harker at ucl.ac.uk>*Date*: Tue, 24 Jul 2012 04:16:18 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: mathgroup-newout@smc.vnet.net*Delivered-to*: mathgroup-newsend@smc.vnet.net*References*: <20120723235352.0ED466790@smc.vnet.net>

It's very clear from the error message what has happened. The message says ERROR: Integrate::ilim: Invalid integration variable or limit(s) in {0.5,a^2+b^2,a^2+(-b+l)^2}. So, at some point before trying to do the integral you have assigned the value 0.5 to x. You can clear this by typing x=. before calling Integrate[]. In general, avoid assigning values to variables, especially simple ones such as x that you are very likely to want to use again later. Better practice is to use rules to insert values into expressions, as in Expr/. X->0.5 Tony Harker ]-> -----Original Message----- ]-> From: Rahul Chakraborty [mailto:rahul.6sept at gmail.com] ]-> Sent: 24 July 2012 00:54 ]-> To: mathgroup at smc.vnet.net ]-> Subject: Integration of expressions with symbolic limits ]-> ]-> Dear Sir, ]-> ]-> I would like to know one thing regarding the above subject, if it is possible ]-> in Mathematica to have a symbolic result. ]-> ]-> My code is as below ]-> ]-> Integrate [a/(2*(x^3/2)*(x-a^2)^1/2),{x,a^2+b^2,a^2+(l-b)^2}] ]-> ]-> ERROR: Integrate::ilim: Invalid integration variable or limit(s) in ]-> {0.5,a^2+b^2,a^2+(-b+l)^2}. >> ]-> ]-> ]-> Regards, ]-> ]-> rc ]->

**References**:**Integration of expressions with symbolic limits***From:*Rahul Chakraborty <rahul.6sept@gmail.com>