As a schoolchild, she had delighted in using a pendulum to make drawings in her exercise books, but it was not until midlife that she found in this process a portal to a larger world of ideas. In 1938, using a silver pendulum with a jade end she believed was guided by energy fields — a technique she termed radiesthesia — she began making large-scale drawings in pencil and crayon on graph paper, hundreds of them, to divine diagnoses of physical and psychic ailments and heal people, often with results bordering on the miraculous.
M. Porter. (2022)cite arxiv:2201.07794Comment: working paper (associated with my data-ethics lecture at the 2021 AMS Short Course on Mathematical and Computational Methods for Complex Social Systems); not yet refereed; private comments and suggestions are appreciated.
M. Escardó. (2019)cite arxiv:1911.00580Comment: 211 pages, extended version of Midlands Graduate School course (2019), includes Agda-verified mathematics. Sources available at github (as explained in the pdf file), but not in LaTeX, last revised September 2022.
K. Ren, and H. Wang. (2023)cite arxiv:2308.08819Comment: 23 pages. v2: fixed small typo in abstract and added more details to arguments, main results unchanged.