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Thank you a lot for your reply. I've tried it out and found the mistake in my previous posting. Sorry, actually, I am trying to make the commands

/subsection
/subsubsection
/paragraph

behave in the same way as /section (not /subsection):

-some space before the heading
-Heading (no plain text in ...

Hello,

I am trying to modify the subsubsection and paragraph headings for a document which uses the documentclass amsbook but so far I have been only half successful.
I have searched this forum and found the sectsty package and I managed to change the font settings etc. but I wasn't able to find ...