24 May 1999 Vol. 4, No. 21
THE MATH FORUM INTERNET NEWS
Kunkel's Math Lessons  Field Guide to Functions  OSU  Calendars  Math Library
KUNKEL'S MATHEMATICS LESSONS  Paul Kunkel
http://www.nas.com/~kunkel/math.htm
Kunkel's Geometer's Sketchpad lessons aim to convey a
conceptual understanding, usually without rigorous proof,
with questions and suggestions for extensions. They include:
 Buffon's Needle  an old probability exercise
 Chinese Handcuffs  questions with applications for
geometry, trigonometry, and probability
 Hanging with Galileo  an investigation into the catenary
 Reuleaux Triangle  a figure that is not a circle, but
has constant width
 Rungs and Vineyards  visual effects seen from a moving
automobile
 Sketchpad Ellipses  investigating ellipses by tracing
triangle transformations
An annotated gallery of sketches, without commentary, for
Physics, Calculus, and other miscellaneous topics is also
provided:
http://www.nas.com/~kunkel/gallery/gallery.htm
Lessons without GSP sketches include:
 Dodecahedron Measures  dihedral angle and volume
 Planimeter  a drafting instrument used to measure area
 Table Patterns  modular multiplication
 Volume of a Torus  with a virtual reality drawing
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FIELD GUIDE TO FUNCTIONS  Oregon State University (OSU)
http://iq.orst.edu/cq/w99/osu_1/FieldGuide/
A review and reference for the functions commonly encountered
in singlevariable calculus, discussing the significance,
basic notation, and properties of each function.
Examples of calculations are on following pages, with
exercises for each topic: linear, polynomial, power,
rational, exponential, logarithmic, trigonometric, and
piecewise functions. Also included are algebraic operations
on functions, function composition, and general types of
functions.
This field guide is designed to support William A. Bogley
and Robby Robson's CalculusQuest, the first in a standard
sequence of University of Oregon calculus courses:
http://iq.orst.edu/cq/
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CALENDARS  Internet Mathematics Library
http://mathforum.org/library/topics/cals_dates_time/
Browse the Math Forum's collection of sites on calendars,
dates, and time, to find lesson plans and articles on
calendars from around the world. Highlights include:
 The Aztec Calendar  Rene Voorburg
http://www.azteccalendar.com/
historical information and illustrations of the two
independent systems comprising the Aztec calendar
 Calendar Quirks  Ivars Peterson (MathTrek)
http://www.maa.org/mathland/mathtrek_12_21_98.html
an article about our efforts to create frameworks that
allow us to reckon time over extended periods
 Calendars  L. E. Doggett
http://astro.nmsu.edu/~lhuber/leaphist.html
an introduction to calendars: what they are; astronomical
bases of calendars; calendar reform and accuracy;
historical eras and chronology; and more
 Day Of The Week Of Any Date  Jim Loy
http://www.mcn.net/~jimloy/dayweek.html
how to figure the day of the week for any date
 The Maya Calendar
http://www.astro.uva.nl/~michielb/maya/calendar.html
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