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author | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
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committer | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
commit | e0c6872cf40896c7be36b11dcc744620f10adf1d (patch) | |
tree | 60335e10d2f4354b0674ec22d7b53f0f8abee672 /graphics/pgf/contrib/ptolemaicastronomy/README.md |
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diff --git a/graphics/pgf/contrib/ptolemaicastronomy/README.md b/graphics/pgf/contrib/ptolemaicastronomy/README.md new file mode 100644 index 0000000000..1b1d10ff13 --- /dev/null +++ b/graphics/pgf/contrib/ptolemaicastronomy/README.md @@ -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 + + + + + + + + + + + + + + + |