Talk:William Ludlam

Note: both

Platts, Charles, Dictionary of National Biography, 1885-1900, Volume 34 - Ludlam, William, 1893.

and

Platts, Charles, "Ludlam, William (bap. 1717, d. 1788), mathematician and writer on theology." Oxford Dictionary of National Biography, 2004. (Accessed 14 August, 2018)

say that Isabella Ludlam (her first name is not given), the mother of Gerrard Andrewes (1750-1825), was William Ludlam's sister. This is not the case.

Nichols, John, The history and antiquities of the county of Leicester : Vol. 1, Part 2, 1815, p318 says that Dr Ludlam's (Richard, William's father) only daughter [Anne] was the second wife of Joseph Cradock (as stated in the ODNB). The ODNB entry for Joseph Cradock (1742-1826), says that Anne Ludlam, sister of mathematicians William and Thomas Ludlam, was his father's second wife. Kylenano (talk) 14:45, 14 August 2018 (UTC)

Playfair's axiom
According to Coxeter, Playfair copied "his" famous Playfair axiom from Ludlam. But there is nothing about that in this article. Here's my reference to Coxeter's famous book about this matter: 1942 '47 '57 '61 '65 1998 6e "Non-Euclidean Geometry" by H. S. M. Coxeter. Also see John Playfair and Playfair's axiom.