‎"KRAFT, JENS.‎
‎Methode at bevise, hvorledes man i alle Tilfælde kand bestemme den ene Ubekiendte ved en u-endelig Følge af Terminis, som gives ved den anden, i de Algebraiske Liigheder, som indeholde to Ubekiendte.‎

‎(Copenhagen, 1751). 4to. In recently blue paper covered card board binding with white paper-label title-label to front board. Previous owner's name to pasted down front end-paper. Without wrappers as issued in ""Videnskabernes Selskabs Skrifter"", a nice and clean copy. Pp. 323-354.‎

Reference : 61841

‎First edition of Kraft’s paper on algebra and infinite series, placing him among the most significant Danish mathematicians of his time. The work presents a method for determining an unknown variable in an algebraic equation using an infinite sequence of terms relating to series expansion techniques later formalized in Puiseux series, which play a role in modern algebraic geometry and analysis. This work is important in understanding Kraft’s ability as both a mathematician and a philosopher. It show his mathematical talent in algebra and infinite series while also aligning with his Newtonian physics and Leibnizian philosophy.‎