Diastereomers vs. Enantiomers vs. Epimers

[BrazilianRider]

So I just want to make sure I got this right...

Enantiomer: 1+ stereocenters, all stereocenters must be reversed (watch out for meso),
Diastereomer: 2+ stereocenters, not all stereocenters reversed,
Epimers: 3,4 stereocenters, one stereocenter reversed.

Does this sound about right? For some reason I'm having the hardest time getting these down in my head...

Thanks in advance everyone.

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[shrister]

Yup you're right. I was having trouble with that stuff earlier too.