An interesting problem has entered mathematical folklore in the 1950s. It was included in the Putnam Competition in 1953 and posted in the problem section of the American Mathematical Monthly in 1958 (Problem E 1321). Martin Gardner wrote about it on three different occasions. While proving an extension of the problem, Paul Erdös came up with his probabilistic...

Complex numbers are points in the plane endowed with additional structure. We consider the set R2 = {(x, y): x, yR}, i.e., the set of ordered pairs of real numbers. Two such pairs are equal if their corresponding components coincide: (x1, y1) = (x2, y2) iff x1 = x2 and y1 = y2. With two operations - addition and multiplication - defined below,...

The applet below illustrates an algorithm for finding the Least Common Multiple (LCM) of a number of integers. Let there be a finite sequence of positive integers X = (x1, x2, ..., xn), n > 1. The algorithm proceeds in steps as follows: on each step m it examines and updates the sequence X(m) = (x1(m), x2(m), ..., xn(m)), X(1) = X. The purpose...

Saat menyaksikan tubuh ramping David Gurnani, pemenang The Biggest Loser Asia asal Indonesia, Anda pasti berdecak kagum. Pria berusia 25 tahun ini berhasil menurunkan 70 kg berat badannya (dari 153 kg...

Orang tidak suka makan sayur itu biasa. Yang aneh mungkin orang yang tidak suka makan buah. Tak seperti sayur yang kadang-kadang terasa pahit atau hambar, buah memiliki rasa yang menyenangkan: asam, manis, atau kombinasi keduanya. Entah mengapa kedua...

You might think there’s nothing special about this bridge, and Milliau Viaduct is indeed one of the more common-looking bridges, but the mere fact that it’s slightly taller than the Eiffel Tower makes it special. Opened to traffic in December of 2004, Milliau Viaduct holds the current record for the world’s tallest vehicular bridge in the world, standing...

Living in Australia presents the following risk: mistake giant snakes for computer cables. Okay so you could spot it if your really careful but it blends in pretty well. So if one of your cables feels slippery and moving, take a good look at it. ...

Oh yeah, we all have this problem…all who can’t afford an expensive cooling system, that is. Anyway I have to admit I also used one of these ventilators to cool down my rig, beats spending large sums of cash on water cooling although it does look primitive. Well here are some photos of ventilators in cooling action, as a tribute to them. ...

You might think that if you come across a deer while going fishing in the ocean right? Well I guess that’s what these boys thought to themselves when they saw this dow while they were fishing quite a long way from shore in Chesapeake Bay. The fish weren’t biting that day so they had time to look around and spot something strange in the water. This...

While religious experts search for proof Noah’s Arc really existed, modern artists build replicas of the ship from The Book of Genesis. Johan Huibers a Dutch creationist from Schagen, Netherlands spent a lot of time and approximately $1.2 million to build a modern-day Noah’s Ark that’s 1/5 of the one described in The Bible. He started thinking...