オーギュスタン＝ルイ・コーシー
Balanced ternary makes an early appearance in Michael Stifel's book "Arithmetica Integra" (1544). It also occurs in the works of Johannes Kepler and Léon Lalanne. Related signed-digit schemes in other bases have been discussed by John Colson, John Leslie, Augustin-Louis Cauchy, and possibly even the ancient Indian Vedas.