Correction to oblig 1

I've been made aware of some 'vagueness' in Problem 8 of oblig 1. This has now been corrected, and you can download the new version of the whole thing here.

The oblig is still due on 29 September. You can either turn it in to Kai or me in class or you can email it to me at p.e.isachsen@geo.uio.no.

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