I’m back

Hello all.

For the last several weeks I’ve ignored this site completely, instead focusing on writing and looking after my family. (The posts that were published during this time were written months ago.) I’ll start paying it a little more attention now, beginning with the 50 unanswered messages in my inbox (!) though it may take me a while to get caught up.

Thank you all for reading, and especially for taking time to point out errors.


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  • Peter Marshall  On January 10, 2012 at 6:21 pm

    Glad to hear you are back!

    Hoping you reach Ch 17 on Homology soon.

    There are very few undergraduate level introductions to homology – D&F is one of the few. Further, there are very few worked examples on the topic and very very few exercises with solutions.


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