Printer's Errors

Typesetting ``errors'' in which exponents or multiplication signs are omitted but the resulting expression is equivalent to the original one. Examples include

$\begin{displaymath} 2^5 9^2=2592 \end{displaymath}$

$\begin{displaymath} 3^4 425=34425 \end{displaymath}$

$\begin{displaymath} 31^2 325=312325 \end{displaymath}$

$\begin{displaymath} 2^5\cdot {\textstyle{25\over 31}}=25 {\textstyle{25\over 31}}, \end{displaymath}$

where a whole number followed by a fraction is interpreted as addition (e.g., $1 {\textstyle{1\over 2}}=1+{\textstyle{1\over 2}}={\textstyle{3\over 2}}$ ).

See also Anomalous Cancellation

References

Dudeney, H. E. Amusements in Mathematics. New York: Dover, 1970.

Madachy, J. S. Madachy's Mathematical Recreations. New York: Dover, pp. 174-175, 1979.