On the Foundations of Inversion Geometry

How to Use History to Clarify Common Confusions in Geometry

“…(We would say that this is because it was part of a separate strand.) For discussion of properties of circle inversions, see [4], [9], [27,Section 37], [31,Chapter 14], [37], and [49,Chapter 15]. A systematic study of inversions in circles started only in the 19th century.…”