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# Questions

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### mapping spaces of diagrams

feb 15 12 at 1:55 Tom Goodwillie 26.6k258110

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### do spectra have diagonal maps?

jan 2 12 at 0:34 John Klein 7,1031928

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### what does BG classify? i.e. what is a principal fibration?

dec 9 11 at 22:45 Peter May 12k13854

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### CW complexes and paracompactness

jun 25 11 at 9:12 Stephen S 784179

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### Is the mapping cylinder of a Serre fibration also a Serre fibration?

oct 2 10 at 20:52 John Rognes 1,15679

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