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Ever arrive at someone 's house unannounced , but it looks like they were expecting you ? When he was tired he lay face-downward on the grass and watched the eager scurrying of minnows and of tadpoles . These last three sets correspond to the rotation sets of three Plato 's solids : the regular tetrahedron , octahedron and icosahedron . The " I 'm Okay " Message Center ( http://okay.prodigy.net/ ) was set up in response to this and allows people to post a brief message with their name and location . Finally , successful students also have found that , just prior to the next class ( perhaps fifteen minutes before class begins , or even on the way to class ) a quick reread of the " old " class notes as well as the " new " text section gives them an edge , especially if there is a quiz ( announced or unannounced ) . In this talk , we plan to give a brief introduction to the topic of symbolic dynamics . These courses are accelerated , more concept-oriented versions of the regular sequences designed to challenge the well-prepared , highly motivated student , not necessarily a math major . The result was outstanding : In the following year twice the historical average percentage of seniors took worthwhile math courses , and in 1979 , on the regular Math Placement Test , the number of students placing Level 1 increased four-fold over the historical average for that school.In the following years 7 , 37 and 107 schools asked that we give an Early Placement Test , all of which we paid for from the College budget . We will discuss the problem itself , as well as provide a brief introduction to elliptic curves . The four regular faculty are Ruth Charney , associate professor in the area of topology , and three assistant professors , Sheldon Kamienny , Karl Rubin and Alice Silverberg , in the area of number theory.Harvey Friedman was among a group of distinguished scientists , mathematicians and engineers invited to a luncheon with President Ronald Reagan at the White House . Our regular staff continues to grow as well .