Surprising DSolve problem
- To: mathgroup at smc.vnet.net
- Subject: [mg123944] Surprising DSolve problem
- From: Sam Takoy <sam.takoy at yahoo.com>
- Date: Mon, 2 Jan 2012 02:42:06 -0500 (EST)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
Hi, I find that my Mathematica (8.0.1) can do DSolve[ y''[x] + (2 y[x])/(Cosh[x]^2) == 0, y, x] but can't do DSolve[ y''[x] + (2 y[x])/(a^2 Cosh[x/a]^2) == 0, y, x] (*Additional constant "a") If I am not mistaken, the equations are equivalent by a trivial change of variables. What's going on here? Thanks, Sam
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