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Graham Higman's lectures on januarials

Martson Conder and Timothy Riley

The Quarterly Journal of Mathematics (Oxford), 65 (1), pages 113–131, 2014

This account, part historical and part original, is based on a series of lectures of Graham Higman on januarials, namely coset graphs for actions of triangle groups which become 2-face maps when embedded in orientable surfaces.


coset diagram