I'm trying to read Serre's book on Lie algebras and have run into something I can't figure out. Luckily it's on google books so I'll just post a link to the point in question:(adsbygoogle = window.adsbygoogle || []).push({});

http://books.google.com/books?id=ha...&q="principle of lifting invariants"&f=false"

What the heck is the principle of lifting invariants? I can't find anything useful on google easily, and attempts to just prove the result myself fall short (I'm not even sure what the hypothesis is supposed to be, or what the principle is supposed to state exactly). Any illumination would be greatly appreciated

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# Lifting invariants for SES

Can you offer guidance or do you also need help?

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