Date: 01/09/2002 at 09:22:19 From: David Rader Subject: Palindromic words Good morning Dr. Math, We all know that numbers such as 191 are called palindromes. Is there a name for words like SWIMS that look the same after a rotation of 180 degrees (flipped and upside-down to my grade 3 students)? This is a first for me. I hope you can help. Dave Rader
Date: 01/09/2002 at 10:08:20 From: Doctor Paul Subject: Re: Palindromic words It's called an inversion. Scott Kim wrote a book on inversions in 1981 (ISBN 0716720442). Samples of his work (the best I've ever seen) are at his website: http://scottkim.com/inversions/ I hope this helps. Please write back if you'd like to talk about this more. - Doctor Paul, The Math Forum http://mathforum.org/dr.math/
Search the Dr. Math Library:
Ask Dr. MathTM
© 1994- The Math Forum at NCTM. All rights reserved.