http://www.theoremoftheday.org/ A gallery whose exhibits are the crowning achievements of mathematics: its theorems. http://www.theoremoftheday.org/TotDLogo.jpg http://www.theoremoftheday.org/ http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Binomial/Lame/TotDLame.pdf Theorem of the Day has a 'new acquisition': Lamé's Theorem Announce: Theorem no. 87 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Analysis/CauchyKovalevskaya/TotDCauchyKovalevskaya.pdf Theorem of the Day has a 'new acquisition': the Cauchy-Kovalevskaya Theorem Announce: Theorem no. 88 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GroupTheory/MChan/TotDMChan.pdf The theorem of Melody Chan (no. 51) has a corrected and improved presentation Update: #1 to Theorem 51 http://www.theoremoftheday.org/Theorems.html Non-trivial corrections have been made to the pictures illustrating the DPRM Theorem (no. 43) and Moufang's Theorem (no. 61) Update: #1 to Theorem 43 and Theorem 61 http://www.theoremoftheday.org/Shop/Shop.htm Theorem of the Day Gallery Shop now open for browsing News: Shop open for browsing http://www.theoremoftheday.org/Shop/Shop.htm You can now buy the Theorem of the Day 2008 calendar "12 Theorems by Women Mathematicians" at the on-line shop News: Shop open for purchases http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Statistics/AbelHurwitz/TotDAbelHurwitz.pdf Theorem of the Day has a 'new acquisition': the Abel-Hurwitz Binomial Theorem Announce: Theorem no. 89 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Binomial/Binomial/TotDBinomial.pdf Non-trivial corrections have been made to the description of the Binomial Theorem Update: #1 to Theorem 47 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/NumberTheory/Lutz/TotDLutzNagell.pdf A correction has been made to the Lutz-Nagell Theorem concerning the point of order 2 (it isn't rational! - thanks to Shaun Stevens at UEA for pointing that out) Update: #1 to Theorem 81 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Analysis/Cardano/TotDCardano.pdf Theorem of the Day has a 'new acquisition': Cardano's Cubic Formula. This will be the last theorem added this year; happy 2008 to all my visitors! Announce: Theorem no. 90 http://www.theoremoftheday.org/Shop/Shop.htm T-shirts now available from Theorem of the Day Gallery Shop News: T-shirts available http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/NumberTheory/KhinchinCF/TotDKhinchin.pdf Theorem of the Day has a 'new acquisition': Khinchin's Theorem on Continued Fractions. The first new theorem of 2008: Happy New Year to all my visitors! Announce: Theorem no. 91 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Analysis/Quadratic/TotDQuadratic.pdf Theorem of the Day has a 'new acquisition': The Quadratic Formula. Announce: Theorem no. 92 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/MusicAndArt/Hexachord/TotDHexachord.pdf Theorem of the Day has a 'new acquisition': the Generalised Hexachord Theorem Announce: Theorem no. 93 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/Ramsey/TotDRamsey.pdf A 'Ramsey Theory Contest', proposed by David Cariolaro, has been added to Theorem no. 28: Ramsey's Theorem. News: Ramsey Theory Contest http://www.theoremoftheday.org Search Theorem of the Day by google has been added to the Theorem of the Day homepage. Type in your favourite mathematical term and see what comes up! News: google search added http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Analysis/Convolution/TotDConvolution.pdf Theorem of the Day has two 'new acquisitions': Cayley's Formula and the Convolution Theorem Announce: Theorem nos. 94 and 95 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/Sarrus/TotDSarrus.pdf Theorem of the Day has a 'new acquisition': the Rule of Sarrus Announce: Theorem no. 96 http://www.theoremoftheday.org/Shop/Shop.htm The 2008 wall calendar "12 Theorems by Women Mathematicians" is now reduced in price to £10 + postage and packing News: calendar price reduction http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Analysis/Cartwright/TotDCartwright.pdf Theorem of the Day has two 'new acquisitions': Nevanlinna's Five-Value Theorem and Cartwright's Theorem Announce: Theorem nos. 97 and 98 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/Dilworth/TotDDilworth.pdf 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. Update: #1 to Theorem 19 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/EstherKlein/TotDEstherKlein.pdf Theorem of the Day has a 'new acquisition': The Happy Ending Problem Announce: Theorem no. 99 http://www.theoremoftheday.org/VisitorsBook/VisitorsBook.htm Theorem of the Day now has a Visitors' Book where you can share your thoughts about theoremoftheday.org or just about theorems in general News: Visitors Book added http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/DoC/TotDDoC.pdf 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! Announce: Theorem no. 100 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/Kepler/TotDKepler.pdf Theorem of the Day has a 'new acquisition': Kepler's Conjecture Announce: Theorem no. 101 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/Viete/TotDViete.pdf Theorem of the Day has a 'new acquisition': Viète's Formula Announce: Theorem no. 102 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/Parking/TotDParking.pdf Theorem of the Day has a 'new acquisition': The Parking Function Formula Announce: Theorem no. 103 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/GMR/TotDGMR.pdf Theorem of the Day has a 'new acquisition': The Goins-Maddox-Rusin Theorem on Heron Triangles Announce: Theorem no. 104 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/LogicAndComputerScience/PumpingLemma/TotDPumping.pdf Theorem of the Day has a 'new acquisition': The Pumping Lemma Announce: Theorem no. 105 http://www.theoremoftheday.org/Shop/Shop.htm 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! News: calendar price final reduction http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/MusicAndArt/Babbitt/TotDBabbitt.pdf Theorem of the Day has a 'new acquisition': Babbitt's Theorem Announce: Theorem no. 106 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/Tverberg/TotDTverberg.pdf Theorem of the Day has a 'new acquisition': The Tverberg Partition Theorem Announce: Theorem no. 107 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/ATST/TotDATST.pdf Theorem of the Day has a 'new acquisition': The Analyst's Travelling Salesman Theorem Announce: Theorem no. 108 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/OR/BHH/TotDBHH.pdf Theorem of the Day has a 'new acquisition': The Beardwood-Halton-Hammersley Theorem Announce: Theorem no. 109 http://www.theoremoftheday.org/Resources/Mathematicians.html 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! News: Index of Mathematicians added http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/LogicAndComputerScience/DeMorgan/TotDDeMorgan.pdf Theorem of the Day has two 'new acquisitions': The Robbins Problem and De Morgan's Laws Announce: Theorem nos. 110 and 111 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/Bregman/TotDBregman.pdf Theorem of the Day has a 'new acquisition': Bregman's Theorem Announce: Theorem no. 112 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/VDW/TotDVDW.pdf Theorem of the Day has a 'new acquisition': van der Waerden's Conjecture Announce: Theorem no. 113 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GroupTheory/Loops/TotDLoops.pdf Theorem of the Day has a 'new acquisition': the Lagrange Property for Moufang Loops Announce: Theorem no. 114 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/NumberTheory/Partitions/TotDPartitions.pdf Theorem of the Day has a 'new acquisition': the Hardy-Ramanujan Asymptotic Partition Formula Announce: Theorem no. 115 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/Coprimality/TotDCoprimality.pdf Theorem of the Day has a 'new acquisition': the Polynomial Coprimality Theorem Announce: Theorem no. 116 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/ErdosWilson/TotDErdosWilson.pdf Theorem of the Day has a 'new acquisition': a Theorem of Erdos and Wilson on Edge Colouring Announce: Theorem no. 117