## Origin of Mysterious Portuguese Mathematical and Geographical Tiles Revealed

A few months ago I wrote about some mystifying mathematical and geographic tiles I encountered at the National Tile Museum in Lisbon, Portugal.

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A few months ago I wrote about some mystifying mathematical and geographic tiles I encountered at the National Tile Museum in Lisbon, Portugal.

November 5, 2014 — Jennifer Frazer

“The treatise itself, therefore, contains only twenty-four pagesthe most extraordinary two dozen pages in the whole history of thought!” “How different with BolyaiJnos and Lobachvski, who claimed at once, unflinchingly, that their discovery marked an epoch in human thought so momentous as to be unsurpassed by anything recorded in the history of philosophy or of [...]

February 12, 2014 — Evelyn Lamb

How many math lovers live in New York City? Its a tough count to make, but the Museum of Mathematics made progress at its first anniversary celebration on Thursday, December 5.

December 11, 2013 — Rachel Feltman

In 1879, Charles Dodgson, better known as Lewis Carroll, published an odd little book called Euclid and his Modern Rivals (available for free at the Internet Archive).

March 4, 2014 — Evelyn Lamb

Haversine? Exsecant? An introduction to obsolete trig functions and why we don't use them anymore

September 12, 2013 — Evelyn Lamb

My math history class is currently studying non-Euclidean geometry, which means we've studied quite a few "proofs" of Euclid's fifth postulate, also known as the parallel postulate.

October 28, 2014 — Evelyn Lamb

Forces in society of late have lots of us longing for the days of the Enlightenment, smallpox, powdered wigs, ridiculously uncomfortable clothing and all.

July 25, 2014 — Jennifer Frazer

In February, I wrote about Euclid’s parallel postulate, the black sheep of the big, happy family of definitions, postulates, and axioms that make up the foundations of Euclidean geometry.

April 21, 2014 — Evelyn Lamb

Surfaces are complicated. Triangles are simple. That’s an idea behind some methods of creating computer graphics and some advanced mathematics.

November 30, 2013 — Evelyn Lamb

Last year, the inimitable Vi Hart made a Thanksgiving video series, describing how to imbue your holiday celebration with more mathematics.

November 27, 2013 — Evelyn Lamb

Euclidean geometry, codified around 300 BCE by Euclid of Alexandria in one of the most influential textbooks in history, is based on 23 definitions, 5 postulates, and 5 axioms, or “common notions.” But as I mentioned in my recent post on hyperbolic geometry, one of the postulates, the parallel postulate, is not like the others.

February 28, 2014 — Evelyn Lamb

As I wrap up a trip to the UK, I reflect on the many objects of constant width I encountered here.

July 4, 2014 — Evelyn Lamb