# Formula for pi

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There's a Hidden Connection Between Pi and Quantum Mechanics

For the first time, scientists have discovered a classic formula for pi in the world of quantum physics. Pi is the ratio between a circle's circumference and its diameter, and is incredibly important in pure mathematics, but now scientists have...

In 1655 the English mathematician John Wallis published a book in which he derived a formula for pi as the product of an infinite series of ratios. Now researchers, in a surprise discovery, have found the same formula in quantum mechanical calculations of the energy levels of a hydrogen atom.

A pair of quantum scientists calculating the energy levels of a hydrogen atom at the University of Rochester have discovered a 360-year-old formula for pi in their equations.

In 1655 the English mathematician John Wallis published a book in which he derived a formula for pi as the product of an infinite series of ratios. Now researchers, in a surprise discovery, have found the same formula in quantum mechanical calculations of the energy levels of a hydrogen atom.

Physicists have uncovered a hidden connection between a famous 350-year-old mathematical formula for pi, everyone’s favorite irrational number, and quantum mechanics. At least one mathematician has pronounced the discovery “a cunning piece of magic.”

Using Cron for scheduling tasks Cron, also known as crontab (aka cron table) has a schedule formula for any minute of any day of the week, month and even any year in the future. It is perfect for scheduling repetitive tasks on for example the Raspberry Pi running Raspbian. This post will go through the basics and some tips on how to use Cron’s functionality. http://www.behind-the-scenes.co.za/using-cron-for-scheduling-tasks/

The math professor in your life will be so surprised to receive a card for Pi Day (March 14)! This one features an image of a old-fashioned black chalkboard with a handwritten formula for pi.

Matching Pi Attenuator Calculator #matching #network #design http://jamaica.remmont.com/matching-pi-attenuator-calculator-matching-network-design/ # CHEMANDY ELECTRONICS Suppliers of the unusual Matching Pi Attenuator Calculator Calculates the resistor values, attenuation, minimum attenuation, impedance, reflection coefficient, VSWR and return loss of a matching Pi attenuator. This can be built into a FLEXI-BOX and a transmission line (50 Ohm track) PCB is available which easily adapts for…

Mechanical PI is a computing machine (re)placing the repetitive algorithm back into a physical, mechanical language. A constant rotation, pressing and repeating the calculator’s keys, approaching the number Pi, yet never reaching it. The machine utilizes the Leibniz formula for pi which is an infinite series of additions and subtractions of quotients. Each subsequent denominator in this series is the sum of the previous one plus two, starting with the value one.