TY - JOUR T1 - Functions of Positive and Negative Type, and Their Connection with the Theory of Integral Equations JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 83 IS - 559 SP - 69 EP - 70 PY - 1909/11/03/ UR - http://dx.doi.org/10.1098/rspa.1909.0075 M3 - doi:10.1098/rspa.1909.0075 AU - Mercer, J. ER -