The authors wish especially to thank the many flexagon enthusiasts with whom they have conferred or communicated. These include Harold V. McIntosh, C. O. Oakley and R. J. Wisner, L. B. Tuckermann, Arthur Stone, and John Tukey.
Finally, the authors would appreciate news of new developments which may reach the ears of the reader; correspondence may be addressed simply Baldwin, Maryland.
Anthony S. Conrad
Daniel K. Hartline
May 5, 1962.
Flexagons are ostensibly a mathematical recreation, and as is frequently the case turn out not only to have a substantial underlying theory, but a close relation to other seemingly unrelated topics as well. At first, they have been studied simply because they were interesting, and that along is sufficient justification. It is accordingly gratifying to find that the theory is closely related to certain types of programming languages, because in this way those who feel that mathematical research must have an application can take the same delight in a beautiful theory brought to an elegant conclusion, that I have found in supporting this study on its own merits.
Harold V. McIntosh
Baltimore, 14 May 1962.