TY CONF TI Point calculus. Historical background and basic definitions KW Point calculus KW historical reference KW applied geometry KW space simplex KW point KW parallel projection invariant JO International Conference "Computing for Physics and Technology - CPT2020" AU Balyuba, I.G. AU Konopatskiy, E.V. PY 2025 PB ANO "Scientific and Research Center for Information in Physics and Technique"