Theorem of the Day has a 'new acquisition': the Rule of Sarrus

The 2008 wall calendar "12 Theorems by Women Mathematicians" is now reduced in price to £10 + postage and packing

Theorem of the Day has two 'new acquisitions': Nevanlinna's Five-Value Theorem and Cartwright's Theorem

A new version of Dilworth's Theorem has been posted. For snooker fans, the old one remains accessible at position 19 in the Complete List.

Theorem of the Day has a 'new acquisition': The Happy Ending Problem

Theorem of the Day now has a Visitors' Book where you can share your thoughts about theoremoftheday.org or just about theorems in general

Theorem of the Day has a 'new acquisition': the Design of the Century. This is theorem no. 100 to be added to the site! Please feel free to leave a message of encouragement in our Visitors' Book and thank you for your continued interest!

Theorem of the Day has a 'new acquisition': Kepler's Conjecture

Theorem of the Day has a 'new acquisition': Viète's Formula

Theorem of the Day has a 'new acquisition': The Parking Function Formula

Theorem of the Day has a 'new acquisition': The Goins-Maddox-Rusin Theorem on Heron Triangles

Theorem of the Day has a 'new acquisition': The Pumping Lemma

I have made a final reduction for the last few copies of the 2008 wall calendar "12 Theorems by Women Mathematicians" to to cost price: £7 + postage and packing. Last chance to get this collector's item!

Theorem of the Day has a 'new acquisition': Babbitt's Theorem

Theorem of the Day has a 'new acquisition': The Tverberg Partition Theorem

Theorem of the Day has a 'new acquisition': The Analyst's Travelling Salesman Theorem

Theorem of the Day has a 'new acquisition': The Beardwood-Halton-Hammersley Theorem

Theorem of the Day now has an Index of Mathematicians with more than 150 entries. Find out why it is an advantage for your name to begin 'Ca' if you want to be a famous mathematician!

Theorem of the Day has two 'new acquisitions': The Robbins Problem and De Morgan's Laws

Theorem of the Day has a 'new acquisition': Bregman's Theorem