Theorem of the Day



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Posted by jojo  17:59, 28 11 2016  Austin, TX 
This is an awesome website! Love the conciseness. 
Posted by SMD  04:04, 28 11 2016  Greece 
I thought it was a great idea, until I read the proofs of two theorems. I mean,really? You violated the beauty of Euler's identity and Stirling's formula by using tau over pi. This is ridiculous, preposterous and unacceptable. Use pi. Shame on you for promoting tau. Tau is a muon, a subatomic particle in Physics. It's not a mathematical constant, no matter how much you promote it. I mean even the symbol is ridiculous. You could have used pistar, as an analogy to hbar. In this way it would show the connection to the fundamental constant pi, as hbar shows the connection to Plank's constant h. 
Posted by Salman Aslam  15:05, 15 02 2016  LUMS, Pakistan 
Great job. Keep up the great work!! All the best. 
Posted by Sam  00:30, 10 10 2015  CMU 
Thank you for the ErdosKoRado theorem! 
Posted by Zach  06:20, 19 08 2015  Boston, MA 
Amazing site! You should aim to include Gershgorin's Theorem! It's rather visual. en.wikipedia.org/wiki/Gershgorin_circle_theorem. 
Posted by Pedro  20:37, 15 08 2015  Peru 
I just wanted to send this message for saying THANKS for maintaining this interesting and curious website! All the best! 
Posted by crono  03:45, 17 06 2015  México 
Amazing work! Mostly the thing I would do in a work like this. 
Posted by embossitworld  11:50, 16 06 2015  embossitworld 
Hello, I have browsed most of your posts. This post is probably where I got the most useful information for my research. Thanks for posting, maybe we can see more on this. Are you aware of any other websites on this subject. 
Posted by Bob lalas  08:32, 23 06 2014  robertboblalas@gmail.com 
I thing this site is doing some new and interesting things. Keep it up. 
Posted by gopal  17:56, 15 06 2014  india 
amazing page i love maths. 
Posted by FATEN AYUNI BINTI SARKAN  18:15, 19 05 2014  MALAYSIA 
I love ur jobs very much..keep ur good job :) 
Posted by Douglas Hainline  07:03, 23 04 2014  UK 
Thanks for a wonderful site! This should be more widely known. 
Posted by dobry  09:24, 19 04 2014 
I like youre website, it's very helpfull please revisit also mine 
Posted by Edier Castaneda  20:50, 20 08 2013  universidad catolica de oriente 
wonderful page 
Posted by Dan Bromberg  16:40, 29 04 2013 
You should add the difficult to prove but easy to understand "Steiner Lehmus" Theorem. 
Posted by Aperna Deb  16:26, 15 10 2012  India 
Awesome! But where are the proofs? 
Posted by Edmund  21:27, 09 10 2012  London 
Love the idea and the website. 
Posted by Anamika  08:06, 18 02 2012  www.edugain.com 
Good website with great content. 
Posted by Paul Chernoff  12:07, 15 12 2011  U.C. Berkeley 
Re the list of theorems by women mathematicians: where is Marina Ratner, Michelle Vergne, Jenny Harrison, etc etc? (Of course many women mathematicians, for example Ratner, consider themselves mathematicians, period.) 
Posted by Peter H.  23:08, 10 12 2011 
Great Website, helps me to refresh my Math knowledge. Keeps my brain in training. Thank you very much. 
Posted by Oliver  18:42, 28 11 2011  Germany 
It is a great website thank you for sharing 
Posted by bottes timberland  06:56, 26 11 2011  shuiwb@yahoo.com 
Many thanks to the person who made this post, this was very informative for me. Please continue this awesome work. Sincerely... 
Posted by Mandie Sullivan  12:12, 07 11 2011  Cursos de Cocina en Barcelona 
Great job! Hours looking for resources and you had all of this here! 
Posted by Cursos de cocina en Barcelona  09:42, 30 10 2011  sebastuper67@gmail.com 
I just want to acknowledge the enormous and fantastic work you do every day. I am very happy to participate in it. Mandie 
Posted by T Russell  23:49, 10 08 2011  Texas, USA 
I must say, this website has made my day. I am SO glad I found out about this. It is now my homepage :) 
Posted by AGT STUDENT  00:54, 14 04 2011  QMUL 
great website sir!! you help make the world a mathematically beautiful place!! 
Posted by Cleveland Web Design  10:27, 05 04 2011  thomas.sherlyn@gmail.com 
Great work 
Posted by Aakriti  13:24, 03 03 2011  India 
Great work!! Love it :) 
Posted by frwe  11:56, 18 02 2011 
Thanks you. 
Posted by R Glen Cooper, PhD  03:23, 22 01 2011  British Columbia, Canada 
Awesome site  congratulations! You've made mathematics compelling. 
Posted by Fio  19:59, 21 01 2011  Stuttgart, Germany 
This website is awesome! I only wish my English was better... 
Posted by Gerard P. Michon, Ph.D.  14:13, 21 12 2010  www.numericana.com 
Back in 2005, when he started this site, Robin Whitty set out for himself a goal of 366 theorems; one per day for an entire [leap] year! The next theorem will be number 183. This is the halfway mark! Congratulations for this great achievement, Robin. Only 183 to go! Gerard Michon, curator of the Numericana Hall of Fame: www.numericana.com/fame/index.htm#whitty 
Posted by Bramma  13:05, 16 12 2010  Bharathidasan Univesity 
amazing web site. 
Posted by Jane Clare Pawling  10:27, 10 12 2010  United States of America 
Hello, I am glad to be able to visit here. 
Posted by stephane berrebi  14:12, 13 11 2010  www.stephberrebi.com 
Wonderful idea, terrific work that could easily become a popular math encyclopedia of reference with some sponsoring and editing ! 
Posted by Sandra Deckard  11:42, 12 10 2010  jeraldine.vanburen@gadway.com 
I really liked your blog! 
Posted by la reference en vente privee  21:37, 04 10 2010  512banque@gmail.com 
Quite an original idea, but why not the proverb of the day ? 
Posted by Morgan  11:19, 04 10 2010  Paris 
Thanks for this website, it reminds me my school studies in engineer school :) by Morgan 
Posted by Mutine  09:29, 04 10 2010  france 
I really enjoy Math, thank you for you work. 
Posted by Marphisa  17:20, 03 10 2010  plantealoevera.tumblr.com 
Great job. The website is wonderful and also shows your excitement with regard to what you do. 
Posted by Richard M. Low  21:57, 13 08 2010  San Jose State University, CA, USA 
This is an excellent website and mathematical resource. Keep up the great work! 
Posted by marcia  07:59, 11 08 2010  australia 
Please find out about your leaders and crimes going on all over the world for ten years now against human rights in general. The own government, in full democracy, is enslaving people, stealing their intelligence, literally, amongst others, you won't believe it. I have proofs exposed of several crimes on my websites. More than 400,000 dead so far gratuitously. I am a victim myself, need your help, am victim since end of 2001, currently slaved. Biotechnology, USA. Please visit hubpages (it is a .com), see profile/MARIAMORTA there to get an idea. The site 'how you can help' brings explanation on what to do. Very little can be done, but reckon it is all there. Rush. Spreading to others already is some help, figures may bring justice, finally, some item of the page 'how you can help' done. Pls rush. 
Posted by Jamie Simpson  05:50, 11 08 2010  Curtin University, Australia 
Good stuff! 
Posted by Nils Wiegner  10:03, 15 06 2010 
Thanks for all the information you share with us. It's always a charme to read everything you post in here. 
Posted by Hicham YAMOUL  09:34, 25 05 2010 
It will very interesting to build the analogous theorem of Van Kampan theorem for the nth homotopy groups, so it will be easy to calculate them. 
Posted by Audrey  01:28, 14 05 2010  USA TX 
Great site 
Posted by Gérard P. Michon  16:11, 08 04 2010  www.numericana.com 
It was a nice surprise to find the 10year anniversary of Numericana mentioned prominently on the front page of "Theorem of the Day"... Thanks, Robin. It's always great to visit this superbly crafted site. The halfway mark (183 theorems) is approaching rapidly... THAT will be a nice cause for celebration! 
Posted by Gaurav Bhatnagar  15:31, 04 04 2010  mathguru.com 
Great site. Thanks. 
Posted by Paul Murray  02:25, 30 11 2009  Cold Hard Truth 
nothing quite like the challenge within the mind :) 
Posted by Hypnosis Johan  02:23, 30 11 2009  Australia 
love your effort robin, top site that is great value. 
Posted by Josh  08:37, 29 11 2009  UK 
I recently bought an A level maths book to try and brush up on the maths I've forgotten since my college days. Its thank's to this site I got back into maths in the first place. Many thanks! 
Posted by Jay  00:27, 28 08 2009  Chicago 
I have been fooling with math too. I really love it. Memorizing binary code and numbers are what I'm into now 
Posted by Noelle  20:20, 19 08 2009  noelle.filippenko@gmail.com 
Do you email the Theorem of the Day. Please add me to your list  thanks. 
Posted by John  10:48, 16 07 2009  Isle of Man 
Yes, Congrats guys! 
Posted by Bill Oswald  04:06, 16 07 2009  Hollywood, USA cckgo@msn.com 
Big Congratulations and Mahalo on the Women's Theorems 2009 Calendar. Will anyone agree with me that the classic Konigsburg Bridge problem reduces to solving 3 equations in 2 unknowns?? Thank you for input. 
Posted by Bob  14:57, 30 06 2009  Italy 
Maths is my passion also! 
Posted by John  12:53, 30 06 2009  UK 
This has also resparked my interest in Maths. I love it  many thanks! 
Posted by Ronstewart  06:45, 23 06 2009  Australia 
There is no simple algebraic formula for the catenary_ 
Posted by Josh  22:57, 17 06 2009  jason@tintophat.com 
This has resparked my interest in Maths. Love it  many thanks! 
Posted by Rupinder Dulay  09:48, 12 05 2009  CDHS Castle Douglas 
A great site even though I find the mathematics very difficult but the real mathematician I work with are using the calendar with their A level students. 
Posted by Imelda Almqvist  19:42, 15 04 2009  www.imeldaalmqvistart.com 
Dear Robin, your website is such a treasure trove of mathematical ideas  I will keep on coming back for more!! Had some fun today with the BorsukUlam Theorem. The ingredients were a tailor's tape measure, a ruler and a 'mathematical balloon' (on which I had scribbled numbers). And you know, I did find number correspondences! The real challenge will of course be to express some of my findings in a painting... With many thanks for feeding me a diet of mathematical concepts! :) Imelda Almqvist 
Posted by Candida  17:08, 12 04 2009  Circle appreciation 
Oooh I just love todays theorem! Very harmonious! Keep up the excellent imagery for a simples way to success Mr.Whitty! 
Posted by Candida  16:54, 27 02 2009  cloud 5 
Absolutely love todays theorem!! Pretty, colourful, intriguing and full of suprises! Happy Birthday to Ms. Sidhu today too! Keep up the good work! x 
Posted by HyeongKwan Ju  06:22, 23 02 2009  Chonnam National University, S. Korea 
Very glad to meet Website like this. Hope this is one giant step to let people outside of mathematical world know what we are doing and concerning ... It is very useful for the mathematician to know the other side of mathematical world. 
Posted by Des Wann  22:31, 05 01 2009  Australia 
What a wonderful site for a retired Head of Mathematics Department! Keeps up my interest in both the history and content of mathematics. It also brings back many memories (both good and bad) dealing with the subtle nuances of the subject. Well done, Robin. 
Posted by Willy Hereman  23:06, 15 12 2008  http://inside.mines.edu/~whereman 
Thank you very much for offering this site and also for the free calendar. Beautiful! 
Posted by Gérard P. Michon, Ph.D.  02:50, 11 12 2008  www.numericana.com 
Your 2009 calendar is beautiful. Thank you so much for producing it. 
Posted by mike newman  01:27, 26 11 2008  ottawa 
Hey you are number one on google! 
Posted by terence tao  20:36, 10 11 2008  ucla 
I want to congratulate you on your beautiful site. may you reach 1000 theorems one day. 
Posted by emri  19:41, 04 11 2008  vendi 
keep up the good work! 
Posted by carrie  13:29, 02 11 2008  hackney 
CRB's 25th? 
Posted by John Kemeny  21:08, 21 10 2008  johnkemeny.com/blog 
Very nice! 
Posted by Harriet Pollatsek  22:35, 18 10 2008  Mount Holyoke College, South Hadley, MA, USA 
Greetings from New England to Old England. 
Posted by Kalun  13:27, 17 10 2008  CEIBS, Shanghai, China 
My students never had so much fun with maths before. Well done, keep up the good work. 
Posted by Harvey  16:42, 03 10 2008  Canada 
A very nice site, Robin. It is attractive and informative. A great contribution to the popularization of mathematics. 
Posted by jaejun  17:36, 04 09 2008  london 
hi do you remember me?? I'm korean we met near the new cross gate before 10 days. your homepage is really intereting.. I'm not sure whether you see or not but, I'll just try have a good day 
Posted by Sam tetruashvili  16:57, 24 05 2008  Carnegie Mellon University, School of Computer Science 
Great site. 
Posted by Andy Drucker  17:50, 23 05 2008  MIT, Massachusetts (grad student, EECS dept) 
Beautiful site! I'll tell my friends. 
Posted by Eileen  08:05, 23 05 2008  ruby.optionextreme.net 
Congratulation, an excellent site, keep up the good work! 
Posted by Kungwa  14:58, 01 05 2008  King's College London 
I would like to reiterate the semirecluse, Charles Wallingford's posting. Keep up the good work 
Posted by Norman  12:48, 01 05 2008  Queen Mary Univ London 
Great site  keep up the good work 
Posted by ahmad  15:18, 18 04 2008  www.mathramz.com 
Hi your site is nice may be i will list it in the mathsite glossary in our site www.mathramz.com regards 
Posted by Candida Bradley  08:57, 07 04 2008  Salford University 
What a delight the cows are today!! ooooh so pretty :) Keep up the good visuals as well as the intriguing maths! 
Posted by Carrie Rutherford  15:39, 12 03 2008  LSBU 
Well, here I am. As you know, I think theorem of the day is GREAT, and I have spread the calendars far and wide. 
Posted by Gagan  12:52, 06 03 2008  London 
Congratulations on the calendar and spreading the word on theorems. Look forward to you next batch of theorem calendars 
Posted by Candida  11:28, 27 02 2008  Salford University 
Thank you for brigthening up my days with your beautifullydrawn and colourful theorems! They make maths seem approachable, even to those who scraped through their maths GCSE. Continue to delight! 
Posted by Fatima Affif Chaouche  09:30, 26 02 2008  University of Sciences and Technology Houari Boumediene. Algiers. Algeria. 
Certainly I am happy to have the opportunity to transmit you my congratulation! Also to thanks you for giving me the possibility to discover this web site, which is really a very important site. Happy that I am in your mailing list. Hope to receive more and more news. Fatima 
Posted by mike newman  00:15, 25 02 2008  Victoria University Wellington, New Zealand 
Congratulations! Happy century, TotD. 
Posted by Taoyang  20:58, 24 02 2008  London 
Congratulations Robin in building the century and Tony in creating the century:) 
Posted by Dave  07:35, 22 02 2008  Durham 
Keep up the good work! 
Posted by Stuart J Hutcheon  18:45, 21 02 2008  London South Bank University 
Congratulations Robin in reaching your century. Well done. 
Posted by sara munday  15:42, 21 02 2008  wwwmaths.mcs.standrews.ac.uk/homepages/sam20.html 
Congratulations on your 100 theorems! Slightly belatedly, many thanks for the calendar of theorems by women mathematicians. It is an inspiration every day. 
Posted by Cahit  15:28, 21 02 2008  www.emu.edu.tr/~cahit/ 
Remarkable achievement. Hope to see other 100 theorems soon. 
Posted by Jean Drabbe  07:53, 20 02 2008  University of Brussels 
I was told about Theorem of the Day be a colleague. I am delighted he did. Congratulations !!! Jean Drabbe University of Brussels (Belgium) 
Posted by Tony Forbes  20:38, 19 02 2008  anthony.d.forbes.googlepages.com/adf.htm 
Hi Robin, Congratulations on reaching that magic number! And how appropriate to celebrate the historic occasion of Theorem 100 with a mathematical object containing word 'century' in its description. Keep up the good work! Best wishes, Tony. 
Posted by John  16:37, 19 02 2008  London 
The calendar looks cool! 
Posted by Pinky  15:14, 19 02 2008  London 
As a nonmathematician, I can only appreciate the theorems from an aesthetic point of view  but love the links to artwork too! 
Posted by Charles Wallingford  15:03, 19 02 2008  Donostia 
Keep up the good work! 