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A Lemniscate Serpent.
Stickers available here.

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Errors using inadequate data are much less than those using no data at all.~Charles BabbageThe 248th day of the year; 248 is the smallest number (above 1) for which the arithmetic, geometric, and harmonic means of φ(n)(Tne umber of positive integers less than n that are relatively prime to it, 120) and σ(n) (the sum of positive integers less than n that are factors of n, 480) are all integers.248 = 28 - 23 248 is the only number such that its unique prime factorization is of the form […]

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We had our first two days of professional development this year and I'm impressed to say I can't complain. Sure there was some stuff I've seen repeatedly (the same required powerpoint on the difference between an accommodation and a modification along with repeated reminders that 504's are legally binding) but the refresher didn't hurt and the new teachers needed to hear it. A new idea we are working on this year is building our cultural competency. The teacher handbook includes a couple […]

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Because the title intrigued me (who would dream of claiming connection with Tony Blair’s “new” Labour move to centre-right?!) , I downloaded William Briggs‘ paper the Third Way of Probability & Statistics from arXiv and read it while secluded away, with no connection to the outside world, at Longmire, Mount Rainier National Park. Early morning […]

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Anyone who peruses mathematical Q&A sites, or had students come to office hours or send questions via other means (email, designated forums, carrier pigeons, or written on a note tied to a brick tossed into your office) knows the following statement: “I don’t know where to begin”, or at least one of its variants. Richard … Continue reading How to solve your problems →

rmathematicus tweeted: @rmathematicus

RT @sharon_howard: #twitterstorians who blog! I need a host for the last History Carnival of 2015 (1 December). Don't know what that is? ht…

2015-09-05 07:09:26

rmathematicus tweeted: @rmathematicus

RT @sciencebookaday: The Lost Elements: The Periodic Table’s Shadow Side http://t.co/4Pvd0fU8kS http://t.co/XULFF1VVeU

2015-09-05 07:09:13

rmathematicus tweeted: @rmathematicus

Jesuit mathematician Giovanno Girolamo Saccheri bor 5 September 1667 – The problem with parallels – https://t.co/Hz7Bn86jAL <= Vaults Post

2015-09-05 06:56:41

pkra tweeted: @pkrautz

@christianp awesome is as awesome doges.

2015-09-05 06:56:06

rmathematicus tweeted: @rmathematicus

2015-09-05 06:53:52

rmathematicus tweeted: @rmathematicus

RT @BNerlich: For weekend readers, my post on the origins and meanings of 'climate wars' https://t.co/TX3uN01rhn #climatechange #climatewars

2015-09-05 06:53:09

rmathematicus tweeted: @rmathematicus

The forces of evil @DrAlun https://t.co/CE3BAFS0Ix

2015-09-05 06:52:48

rmathematicus tweeted: @rmathematicus

RT @telescoper: At least he didn't initiate cuts... https://t.co/EYpE3tG3M9

2015-09-05 06:51:22

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