Canons of page construction. The canons of page construction are a set of principles in the field of book design used to describe the ways that page proportions, margins and type areas (print spaces) of books are constructed.

The notion of canons, or laws of form, of book page construction was popularized by Jan Tschichold in the mid to late twentieth century, based on the work of J. A. van de Graaf, Raúl M. Rosarivo, Hans Kayser, and others.[1] Tschichold wrote, “Though largely forgotten today, methods and rules upon which it is impossible to improve have been developed for centuries.

To produce perfect books these rules have to be brought to life and applied.”[2] Kayser's 1946 Ein harmonikaler Teilungskanon[3] had earlier used the term canon in this context. Typographers and book designers apply these principles to this day, with variations related to the availability of standardized paper sizes, and the diverse types of commercially printed books.[4] Van de Graaf canon[edit] Golden canon[edit] See also[edit] [edit] Roman-Numerals.org.

Ethno. Pixar in a box: New on Khan Academy. Scientists Discover 15th Convex Pentagon Able To Tile A Plane. Consider the ceramic on the floor beneath you.

Those squares or rectangles tile the plane. That's a mathematical term, and finding a new shape that covers a flat surface using only exact copies of that one shape without overlapping or leaving any gaps is a mathematical challenge. All triangles can tile the plane, all quadrangles, too. But only 14 pentagons - five-sided shapes - could do it.

Recreational Math. Cycloid Optical Illusion Will Boggle Your Mind. Optical illusions typically prey on your mind’s ability to fill in blanks in the visual stimulus it is receiving.

Sometimes this can be so strong, your mind continues to be tricked even after it has been explained. Case in point: this video from brusspup, purveyor of mind-melting illusions. The video looks like a wheel made out of eight white circles is rolling around inside of a large, red circle. That’s not what is actually happening, as the video will explain: I don’t know about you, but even after it was explained and the lines were taken away, my brain still wanted to see it as a rolling wheel.

Matematicas Visuales. In MatematicasVisuales you will find visual expositions of mathematical concepts.

MatematicasVisuales intends to complement the work initiated by artiludios , a site with games, puzzles and mathematical curiosities . Reading Miguel de Guzmán I found a demonstration of the line of Simpson and the Steiner Deltoid . It serves as an introduction to the geometry section. The concept of function and its graphical representation are a key concept and we dedicate special attention to it in the analysis section. Geometric representation of the complex numbers facilitates its visualization.

CR Algebra Review.

Free Simulation and Modeling in Your Browser. Algebra Tiles. Virtual Manipulatives. Print Free Graph Paper. Dy/dan » Algebra: The Supplement. Differential Equations. Project MATHEMATICS! Mathematical Formula Tables. Making Math and Science Connections. Fill-It-In Outline Mathematics. Free Mathematics Resources OnLine. What about free graphing and algebra on your mobile phone?

XCalc is a free Java Applet which offers a graphing calculator for any mobile phone which runs Java (which is nearly all of them now!) Think about the possibilities for classes that do not yet have access to graphing calculators! While limited (it does not yet have a trace facility) it DOES offer 2d and 3d graphing which is quite fast and powerful. Well worth a play! Now, combine that with quite a useful algebraic workpad that allows you to define variables and formulas and evaluate these.

Mathematics Assessment. Authentic Assessment in Mathematics Home Page. The Geometry Forum Summer '94 Workshop at Swarthmore College, Swarthmore, PA.

The goal of this project was to collect and organize available INTERNET resources on Authentic Mathematical Assessment applicable to Secondary Schools. What is it? Are there examples? Where can I find additional information? Group Project of:Pat Daley(Fairfield High School, Fairfield, CT: PDaley@Fair1.Fairfield.edu ); Mike Diamond (Pinewood Prep School, Summerville, SC: DiamondM@Citadel.edu); Saundra "Sandi" Handy (Mathematics/Science Demonstration Center, Washington DC: MSDC/Backus@DCNET.mste.org)Howard McKenzie (Essex Catholic High School, East Orange, NJ: HMckeRGI@Delphi.com ); Table of Contents General Information about Assessment Case Study Examples and Lesson Plans Software Listing Bibliography and Alternate Resources Completed by the tireless efforts of Mike Diamondwith little assistance from his sleeping partners.

MacTutor History of Mathematics. Sage: Open Source Mathematics Software. Jim Loy's Mathematics Page. Go to my home page Participate in The Most Pleasing Rectangle Web Poll which recently moved to jimloy.com. "He must be a 'practical' man who can see no poetry in mathematics. " - W. F. White. Dedicated to the memory of Isaac Asimov. My Mathematics Pages were described briefly in the Math Forum Internet News No. 5.48 (27 November 2000). My Mathematics Pages were listed on ENC Online's Digital Dozen for Sep. 2003, as one of the most educational sites on the WWW.