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By Hu S.-T.

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During this quantity, that is devoted to H. Seifert, are papers in response to talks given on the Isle of Thorns convention on low dimensional topology held in 1982.

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I, J } = IJ + J I = 0. 2. Show that the unit quaternions I, J, K generate a group of order 8 under multiplication. Show that this group is isomorphic to O(2; Z). Exhibit this isomorphism explicitly. 3. Show that SU (1; Q) ∼ SU (2; C). 4. Show that the dimensionalities (over the real field) of the general linear groups and their special linear subgroups are G L(n; R) = n 2 G L(n; C) = 2n 2 G L(n; Q) = 4n 2 S L(n; R) = n 2 − 1 S L(n; C) = 2n 2 − 2 5. Show that if the n × n metric matrix G is symmetric, nonsingular, and positive definite, then we can set G = In in the definitions in Example (8).

4. Show that the dimensionalities (over the real field) of the general linear groups and their special linear subgroups are G L(n; R) = n 2 G L(n; C) = 2n 2 G L(n; Q) = 4n 2 S L(n; R) = n 2 − 1 S L(n; C) = 2n 2 − 2 5. Show that if the n × n metric matrix G is symmetric, nonsingular, and positive definite, then we can set G = In in the definitions in Example (8). If the n × n metric matrix G is symmetric, nonsingular, and indefinite, then we can set G = I p,q in the definitions in Example (9), for suitable positive integers p and q, with p + q = n.

Argue that it is impossible to trisect an angle unless cos(3θ ) is such that the cubic factors into the form (x 2 + ax + b)(x + c) = 0, where a, b, c are rational. For example, if cos(3θ ) = 0, c = 0 so that a = 0 and b = −3/4. Then cos(θ) = 0 √ or ± 3/2 for 3θ = π/2 (+), 3π/2 (0), or 5π/2 (−). 2 Lie groups Lie groups are beautiful, important, and useful because they have one foot in each of the two great divisions of mathematics – algebra and geometry. Their algebraic properties derive from the group axioms.

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