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Most cited

This page lists all time most cited articles for this title. Please use the publication date filters on the left if you would like to restrict this list to recently published content, for example to articles published in the last three years. The number of times each article was cited is displayed to the right of its title and can be clicked to access a list of all titles this article has been cited by.

Contents

Page 106 of 187

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  • A geometric slant on determinants

  • Rob Webb
  • Published online by Cambridge University Press:
    22 September 2016, pp. 20-24

  • Many school textbooks state, but few of them prove, that the determinant of a 2 × 2 matrix is the area scale factor of its transformation; whilst a proof of the corresponding result for 3 × 3 matrices is usually delayed until the scalar triple product is available as a technique. Teachers of SMP, or of other ‘modern’ courses containing some development of transformation geometry, may be interested in the following approach to the topic of determinants.

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  • [no title]

  • Tony Robin
  • Published online by Cambridge University Press:
    01 August 2016, p. 112
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  • Quadritangent spheres

  • Michael Fox
  • Published online by Cambridge University Press:
    23 January 2015, pp. 24-39

  • Every tetrahedron has a set of quadritangent spheres, that is, spheres that touch the four planes containing its faces. In this article I discuss three questions about them.

    1. How many quadritangent spheres does a given tetrahedron have?

    2. How can we find their sizes and positions with as little calculation as possible?

    3. What relations exist between the vertices and points of contact that lie on anyone of the planes?

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Page 106 of 187