Volume 24
, Issue 1


There are three items I wish to bring to the reader's attention.

Readers of Parabola are especially invited to consider entering this years School Mathematics Competition.

For reasons which are not entirely clear to me the ancient Egyptians considered fractions $\frac{1}{b}$ much simpler than fractions of the form $\frac{a}{b}$ and they were interested in representing $$ \frac{a}{b} = \frac{1}{x_1} + \cdots + \frac{1}{x_n}$$ where $a$ and $b$ are positive integers and $x_1 < x_2 \l

Survival of a cockroach is unfortunate, survival of an endangered species is important, survival of a human (probably the least endangered species) is essential.

If one wishes to appear wise in the eyes of one's friends it is generally sufficient to inform them that space is not Euclidean, that in fact it is "curved".

Q.732 Let $L$ be the set of $n$ line segments with the property that three of them can be assembled to form a triangle.

Q.720 When the initial digit of a whole number $x$ is deleted, the number decreases by a factor of 13. Find all possible values of $x$.