TY - JOUR T1 - An Essay towards the Calculus of Functions JF - Philosophical Transactions of the Royal Society of London (1776-1886) VL - 105 SP - 389 EP - 423 PY - 1815/01/01/ UR - http://dx.doi.org/10.1098/rstl.1815.0024 M3 - doi:10.1098/rstl.1815.0024 AU - Babbage, C. ER -