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Jan 10, 2014 at 22:46 comment added Geoff Robinson I've amended the text to address this issue.
Jan 10, 2014 at 13:59 history edited Geoff Robinson CC BY-SA 3.0
added 3490 characters in body; Post Made Community Wiki
Jan 9, 2014 at 23:55 history edited Geoff Robinson CC BY-SA 3.0
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Jan 9, 2014 at 23:38 history edited Geoff Robinson CC BY-SA 3.0
edited body
Jan 9, 2014 at 23:28 history edited Geoff Robinson CC BY-SA 3.0
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Jan 9, 2014 at 21:24 history edited Geoff Robinson CC BY-SA 3.0
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Jan 9, 2014 at 0:41 history edited Geoff Robinson CC BY-SA 3.0
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Jan 8, 2014 at 22:00 history edited Geoff Robinson CC BY-SA 3.0
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Jan 8, 2014 at 19:27 history edited Geoff Robinson CC BY-SA 3.0
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Jan 8, 2014 at 9:52 history edited Geoff Robinson CC BY-SA 3.0
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Jan 7, 2014 at 13:50 history edited Geoff Robinson CC BY-SA 3.0
minor typo corrected
Jan 6, 2014 at 23:50 history edited Geoff Robinson CC BY-SA 3.0
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Jan 6, 2014 at 19:33 comment added Derek Holt Why can you assume that $H_1 \cap H_2$ is core-free? To use induction, you would need to know that the quotients of $H_1$ and $H_2$ by the core are isomorphic. Is that clear?
Jan 6, 2014 at 19:23 history answered Geoff Robinson CC BY-SA 3.0