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Sigmoidal functions

A graph that is curved in two directions, similar to a slanted letter S, is called sigmoidal. The inverse tangent function and the hyperbolic tangent function are typical examples. Here is another example:


graphics/IE_sigmoidal__3.png
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Copyright © 2006 Darel Hardy, Fred Richman, Carol Walker, Robert Wisner. All rights reserved. Except upon the express prior permission in writing, from the authors, no part of this work may be reproduced, transcribed, stored electronically, or transmitted in any form by any method.

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