C. J. Sangwin

A Comparison of Equality in Computer Algebra and Correctness in Mathematical Pedagogy (2009)

Bradford, Russell, Davenport, James H, Sangwin, C J

How do we recognize when an answer is “right”? This is a question that has bedevilled the use of computer systems in mathematics (as opposed to arithmetic) ever since their introduction. A...

Controlled functional differential equations: Approximate and exact asymptotic tracking with prescribed transient performance (2009)

Ryan, E. P., Sangwin, C. J., Townsend, P.

A tracking problem is considered in the context of a class S of multi-input, multi-output, nonlinear systems modelled by controlled functional differential equations. The class contains, as a...

What is a mathematical question? (2008)

C J Sangwin

This paper discusses the nature of mathematical assessment, and compares paperbased learning materials with current online assessments. In the light of this comparison we propose a data structure for...

An infinite series of surprises. (2007)

C J Sangwin

Infinite series, that is an infinite sum of the form a1 + a2 + a3 + · · · =

Analemmatic Sundials: how to build one and why they (2007)

C J Budd, C J Sangwin

work

All a matter of balance — or a problem with dominoes. (2003)

C J Sangwin

The problem 1 is this: “when we stack dominoes with only one touching the table, what is the greatest horizontal distance we can cover keeping in balance?” Taking as many dominoes, or other small...

Controlled functional differential equations and adaptive tracking (2002)

Ryan, E. P., Sangwin, C. J.

Systems of controlled functional differential equations and adaptive tracking (2002)

Iichmann, A, Ryan, E. P., Sangwin, C. J.

Tracking with prescribed transient behaviour (2002)

Ilchmann, Achim, Ryan, E. P., Sangwin, C. J.

Tracking with prescribed transient behaviour (2002)

Ilchmann, A, Ryan, E. P., Sangwin, C. J.