Steven Strogatz (@stevenstrogatz) 's Twitter Profile
Steven Strogatz

@stevenstrogatz

Mathematician, writer, Cornell professor. All cards on the table, face up, all the time.

ID: 579299426

linkhttp://www.stevenstrogatz.com calendar_today13-05-2012 21:28:27

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Steven Strogatz
@stevenstrogatz

9 months ago

Today I learned (ht Viktor Blåsjö) how Huygens summed the reciprocals of the triangular numbers. He regrouped the series and showed that it equals the geometric series 1+1/2+1/4+... = 2, like so!

Today I learned (ht <a href="/viktorblasjo/">Viktor Blåsjö</a>) how Huygens summed the reciprocals of the triangular numbers. He regrouped the series and showed that it equals the geometric series 1+1/2+1/4+... = 2, like so!