Re: Mathematica 3.0, 4.0, 4.1 differences in DSolve[]
- To: mathgroup at smc.vnet.net
- Subject: [mg26723] Re: Mathematica 3.0, 4.0, 4.1 differences in DSolve[]
- From: "Paul Lutus" <nospam at nosite.com>
- Date: Fri, 19 Jan 2001 02:14:03 -0500 (EST)
- References: <93r9d2$52v@smc.vnet.net> <MOu96.2591$nn4.77527@ralph.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
"Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de> wrote in message news:MOu96.2591$nn4.77527 at ralph.vnet.net... > Hi, > > > the solution > > p[t]->ip - (Log[1 + (f^2*iv^2)/a] + > 2*Log[Cos[Sqrt[a]*f*t + I/2*Log[1 - (I*f*iv)/Sqrt[a]] - > I/2*Log[1 + (I*f*iv)/Sqrt[a]]]])/(2*f^2) > > is correct. It is easy obtained by lowering the order > of the equation and first solve p1'[t]==f^2*p1[t]+a > > One finds that Mathematica 4.0.2 (with numerous error messages) > find thew correct solution also and the solution is correct. Umm, you may find that 4.1 won't solve it, as I have (unless you mean the above solution was provided by 4.1). 4.0.2 is close enough to the version that I used to solve it initially. In any case, thanks for posting a solution! -- Paul Lutus www.arachnoid.com