On 1st October 2013 I moved to take up a post at Loughborough University.

STACK STACK provides a question type for the Moodle quiz which is specifically designed to enable sophisticated computer-aided assessment in Mathematics and related disciplines, with emphasis on formative assessment. |
DragMath DragMath is a free "drag and drop" equation editor, written in Java. The editor lets users build up mathematical expressions in a traditional two dimensional way, and then output the results in a correctly formed syntax. |

Computer Aided Assessment of Mathematics Chris Sangwin © Oxford University Press, 2013. |
Mathematics for the International Student (IB Diploma):IB HL Option: Calculus Catherine Quinn, et. al.© Haese Mathematics, 2013. |
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Teaching Problem-solving in Undergraduate MathematicsChristopher Sangwin, Matthew Badger, Trevor Hawkes © National HE STEM Programme, University of Birmingham, 2012. |
A Guide to Puzzle-Based Learning in Stem SubjectsMatthew Badger, Christopher Sangwin, Esther Ventura-Medina and Colin Thomas © University of Birmingham, 2012. |
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How Round is Your Circle?John Bryant and Chris Sangwin © Princeton University Press, 2008. |
Mathematics for the International Student:Pre-Diploma SL and HL (MYP 5 Plus) Pamela Vollmar, et. al.© Haese and Harris Publications, 2008. |
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Mathematics Galore!Chris Budd and Chris Sangwin © Oxford University Press, 3 May, 2001. |
Elements of Algebra© Tarquin Publications, 2007 |

Euler's sumOne of my favourite results in mathematics is the following: \[ 1 + \frac{1}{4} + \frac{1}{9} + \cdots = \frac{\pi^2}{6}. \] Leonard Euler's wild and brave explanation is given here. |
The game of HexHex is a connection strategy game for two players. It is simple to learn, great fun to play and has some deep mathematics behind it. Some hex resources. |

Stacking up dominoesApparently you can stack up dominoes in balance in the following way
To see how click here (PDF). |
Roller which are not round!Look at the picture below. It shows two `rollers' in the shape of a 50p with a book on top. What will happen to the vertical distance between the book and the table as you roll the book along? |

Normal vibration modes of a circular membraneImagine an elastic circular membrane fixed along its circular boundary but otherwise free to vibrate. There are a number of different normal vibration modes which are possible. Click here for more details. | The double pendulumA double pendulum consists of two rigid arms that are joined by a low friction bearing. Details are here. |

Chris Sangwin's GeoGebra page with some geometry I find interesting.

Have you seen

- Prof. E. McSquared's calculus primer?
- Tom Lehrer
- Foolproof: A Sampling of Mathematical Folk Humor
- Microcosmographia Academica Being a Guide for the Young Academic Politician, by F. M. Cornford