Paper, 'Observations on the analogy which subsists between the calculus of functions and other branches of analysis' by Charles Babbage Subject: Mathematics Published in Philosophical Transactions as 'Observations on the analogy which subsists between the calculus of functions and other branches of analysis'. Read 17 April 1817. Abstract published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 2, 1833. 5 March 1817