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diff --git a/Master/texmf-dist/doc/latex/ptolemaicastronomy/README.txt b/Master/texmf-dist/doc/latex/ptolemaicastronomy/README.txt new file mode 100644 index 00000000000..1b1d10ff13b --- /dev/null +++ b/Master/texmf-dist/doc/latex/ptolemaicastronomy/README.txt @@ -0,0 +1,37 @@ +ptolemaicastronomy +================== + +Diagrams of sphere models for variably strict conditionals (Lewis +counterfactuals) + +Author: Richard Zach +E-mail: rzach@ucalgary.ca +License: Released under the LaTeX Project Public License v1.3c or later +See: http://www.latex-project.org/lppl.txt + +David K. Lewis (Counterfactuals, Blackwell 1973) introduced a sphere +semantics for counterfactual conditionals. He jokingly referred to the +diagrams depicting such sphere models as Ptolemaic astronomy, hence +the name of this package. It has nothing to do with Ptolemy or with +astronomy, sorry. + +The macros provided in this package aid in the construction of +sphere model diagrams in the style of Lewis. The macros all make use +of TikZ. + +See https://github.com/rzach/ptolemaic-astronomy + + + + + + + + + + + + + + + |