https://skysigal.com/ 2026-04-30T04:53:10+00:00 https://skysigal.com/ https://skysigal.com/lib/tpl/bootstrap3/images/favicon.ico text/html 2023-11-04T21:24:54+00:00 Anonymous (anonymous@undisclosed.example.com) https://skysigal.com/quadrivium/algebra?rev=1699133094&do=diff Quadrivium/Algebra * (UP) quadrivium index Elementary algebra differs from arithmetic in the use of abstractions, such as using letters to stand for numbers that are either unknown or allowed to take on many values. Resources * <https://betterexplained.com/articles/linear-algebra-guide/> * <http://en.wikipedia.org/wiki/Algebra> text/html 2023-11-04T21:24:54+00:00 Anonymous (anonymous@undisclosed.example.com) https://skysigal.com/quadrivium/arithmetic?rev=1699133094&do=diff Quadrivium/Arithmetic * (UP) quadrivium index Elementary Arithmetic involves the study of quantity, and the result of the operations of addition, subtraction, multiplication and division operations. Notes Resources * <http://www.cheat-sheets.org/saved-copy/MATH.CHEAT.SHEET---too.cool.and.imp--MUST.pdf> * Ethopian Multiplication: http://threesixty360.wordpress.com/2009/06/09/ethiopian-multiplication/ * http://www.magicalmaths.org/how-japanese-kids-learn-to-multiply/ * <http://en.wikipedia… text/html 2023-11-04T21:24:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://skysigal.com/quadrivium/geometry?rev=1699133096&do=diff Quadrivium/Geometry * (UP) quadrivium index A branch of mathematics concerned with questions of * shape, * size, * position, and * the properties of space. Resources * PI: * <http://tex.stackexchange.com/a/158959> * <http://en.wikipedia.org/wiki/File:Circle_radians.gif> * <http://en.wikipedia.org/wiki/File:Circle_radians_tau.gif> * Radians: * <https://lh5.googleusercontent.com/-dJsRfi7_Crw/Utl_miUi3II/AAAAAAAA8jM/2ODyIK015WI/s450-no/How+radians+work.gif> text/html 2023-11-04T21:24:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://skysigal.com/quadrivium/home?rev=1699133096&do=diff Quadrivium * (UP) quadrivium index * See also: * Resources * <http://towardthequadrivium.com/?page_id=191> text/html 2023-11-04T21:24:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://skysigal.com/quadrivium/logic?rev=1699133097&do=diff Trivium/Logic Navigation: <callout type="Navigation" class="small"> * (UP) </callout> Logic: the mechanics of Thought. Resources * Fun book online: * <https://bookofbadarguments.com/?view=flipbook> * <http://airpower.airforce.gov.au/APDC/media/PDF-Files/Air%20Force%20Publications/AF13-Applied-Thinking-for-Intelligence-Analysis.pdf> * <https://wiki.lesswrong.com/wiki/A_Human%27s_Guide_to_Words> text/html 2025-11-23T22:29:18+00:00 Anonymous (anonymous@undisclosed.example.com) https://skysigal.com/quadrivium/mathematics?rev=1763936958&do=diff Quadrivium/Mathematics * (UP) quadrivium index * See: * <http://www.cs.yale.edu/homes/aspnes/classes/202/notes.pdf> * <https://0a.io/chapter1/calculus-explained.html> * <https://learnaifromscratch.github.io/math.html> * <https://mathcs.holycross.edu/~ahwang/print/calc.pdf> Mathematics is the abstract study of topics such as * quantity (numbers Quadrivium/Arithmetic, Quadrivium/Algebra ), * position and space (Quadrivium/Geometry) * and change. * <https://arachnoid.com/calculus/ind… text/html 2023-11-04T21:24:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://skysigal.com/quadrivium/trigonometry?rev=1699133098&do=diff Resources * <http://www.touchmathematics.org/topics/trigonometry> text/html 2023-11-04T21:24:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://skysigal.com/quadrivium/trivium?rev=1699133098&do=diff Trivium Navigation: <callout type="Navigation" class="small"> * (UP) * * * </callout> The basis of education. In medieval universities, the trivium comprised the three subjects that were taught first: grammar, logic, and rhetoric. The word is a Latin term meaning