dot is a wonderful tool and the node xlabel attribute allows for an “external label” in addition to the normal internal node label. Placement is always at the top left of the node’s bounding box which isn’t always convenient. There’s
Rene Descartes triggered a revolution in thinking, Cartesianism, and attracted many followers and he became a personage. His thinking was vigorously opposed by the Church. And Louis XIV in 1671 forbade the teaching of Cartesianism at the U of Paris.