Re: Problem with Solve and NSolve

*To*: mathgroup at smc.vnet.net*Subject*: [mg122517] Re: Problem with Solve and NSolve*From*: Andrzej Kozlowski <akoz at mimuw.edu.pl>*Date*: Sun, 30 Oct 2011 04:25:42 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <201110280935.FAA20759@smc.vnet.net> <201110291110.HAA05311@smc.vnet.net>

On 29 Oct 2011, at 13:10, Daniel Lichtblau wrote: > W|A is (probably) using FindRoot in clever ways. You can get solutions > in a similar manner. Wolfram Alpha certainly uses Reduce (or Solve) to solve non-algebraic equations, e.g. try WolframAlpha["Solve[x Exp[x] == 2 Sin[x]&&Abs[x]<=10,x]"] in Mathematica (or directly in a browser). It will show real roots only but if you ask for more you also get the complex ones. If you do not give a bounding condition it will choose one by itself WolframAlpha["Solve[x Exp[x] == 2 Sin[x],x]"] and asssume that you want only real roots. I don't see any evidence that it "is using FindRoot in clever ways". Andrzej Kozlowski

**References**:**Problem with Solve and NSolve***From:*"V. Williams" <gvicente@gmail.com>

**Re: Problem with Solve and NSolve***From:*Daniel Lichtblau <danl@wolfram.com>