Descartes' theorem He rediscovered the Descartes' theorem in 1936 and published it as a poem, "The Kiss Precise", quoted at Problem of Apollonius. The kissing circles in this problem are sometimes known as Soddy circles.
DEScaRTES' theoreM hE RediscoveREd tHE descartes' thEorEM in 1936 aNd pUblished it As A Poem, "tHe kisS pREcISe", QuOtED At ProblEM oF apOLLonius. the kissiNg CIrcLes in thIs pRoblEm ARe sOmeTimEs knowN aS soddy CircLes.