Volume 5, Number 23

5 June 2000 Vol. 5, No. 23 THE MATH FORUM INTERNET NEWS Encyclopedia of Triangle Centers - Kimberling Analytical Engine - Walker | Arithmetic - Banfill ENCYCLOPEDIA OF TRIANGLE CENTERS - Clark Kimberling http://cedar.evansville.edu/~ck6/encyclopedia/ A searchable catalogue of hundreds of special triangle points, including classical centers, points on Euler line, isogonal conjugates of classical centers, centers on circumcircle, on nine-point circle, centers of central triangles, isoscelizer centers, isoperimetric point, equal-detour point, Ajima-Malfatti points, Apollonius center, Ceva conjugates, isotomic conjugates, center of Parry circle, Morley centers, Hofstadter points, Kenmotu point, Yff-Malfatti point, Gossard perspector, centers on Euler line, Tixier points, center of Yiu conic, Eppstein points, Evans perspector, van Lamoen square-associated centers, centers on line at infinity, etc. For pictures and constructions of selected cases, see Kimberling's Triangle Centers: http://cedar.evansville.edu/~ck6/tcenters/ -|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|- THE ANALYTICAL ENGINE - John Walker http://www.fourmilab.to/babbage/ In the late 1800s, the mathematician Charles Babbage designed an Analytical Engine, a mechanical precursor to the computer. Read historical documents related to the Engine, including Blaise Pascal's account of his mechanical adding machine (in French), as well as Babbage's comments on designing ciphers. http://www.fourmilab.to/babbage/contents.html The site also allows you to run example programs, download the Java source code, and explore a Java emulator of the Analytical Engine: http://www.fourmilab.to/babbage/applet.html -|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|- ARITHMETIC - John Banfill http://members.aol.com/_ht_a/iongoal/tablcont.htm Online interactive lessons, exercises, practice, and games for grades K-8, designed to help students learn basic arithmetic concepts and methods. Browse the table of contents, or use the Topic Index to find links to specific skill pages on addition, comparing quantities, counting, decimals, division, estimation, factors, fractions, money, multiplication, naming numbers, ordinal numbers, percent, place value, positions, properties, ratios, and subtraction. http://members.aol.com/_ht_a/iongoal/subject.htm -|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|- CHECK OUT OUR WEB SITE: The Math Forum http://mathforum.org/ Ask Dr. Math http://mathforum.org/dr.math/ Problems of the Week http://mathforum.org/pow/ Mathematics Library http://mathforum.org/library/ Teacher2Teacher http://mathforum.org/t2t/ Discussion Groups http://mathforum.org/discussions/ Join the Math Forum http://mathforum.org/join.forum.html Send comments to the Math Forum Internet Newsletter editors _o \o_ __| \ / |__ o _ o/ \o/ __|- __/ \__/o \o | o/ o/__/ /\ /| | \ \ / \ / \ /o\ / \ / \ / | / \ / \

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