Continous numbering of formulas

[Martin Vonwald]

Hi there!

I am writing a document with book (koma-script) style and I need the
equations numbered continous  across different chapters (1, 2, 3, 4, ...
instead of 1.1, 1.2, 2.1, 2.2, ..). I added
  \renewcommand{\theequation}{\thesection.\arabic{equation}}
to the preamble, but then I get something like 1, 2, 1, 2, 3, 1, 2, ...
What do I have to add to the preamble so that the equation counter is
NOT reset at each chapter?

Thanx in advance, Martin

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