Miimaamsaa - Clarification

[Chandran, Nanda (NBC)]

I hear that Miimaamsaa means "investigation". So what do Purva and
Uttara Miimaamsaa mean? And what's the reason for naming the schools so?

Also Vidya mentioned sometime back that both Samkhya and Purva
Miimaamsaa don't care for a creator God. Can somebody explain?

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