TY - JOUR T1 - On a Condition that a Trigonometrical Series Should have a Certain Form JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 88 IS - 606 SP - 569 EP - 574 PY - 1913/07/18/ UR - http://dx.doi.org/10.1098/rspa.1913.0054 M3 - doi:10.1098/rspa.1913.0054 AU - Young, W. ER -