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From: psycho_dad <s.nesseris@gmail.com>
Newsgroups: comp.soft-sys.math.mathematica
Subject: Re: Differential Equation
Date: Wed, 30 Apr 2014 05:39:49 +0000 (UTC)
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Xref: csiph.com comp.soft-sys.math.mathematica:16875

Hi,
The correct syntax is this:
DSolve[{Y'[x] == A*f[x] - B*Y[x], Y[C] == 0}, Y[x], x]

Notice the brackets {} and the Y[x]. See the help of DSolve for more examples etc.

Cheers