Thursday, January 19, 2012

Wikipedia Blackout, yesturday

The blackout, which started at 5am yesterday, was organised as a protest against two Bills aimed at stopping copyright infringement currently working their way through the US government but it was saw in the UK

Campaigners say the Stop Online Piracy Act (Sopa) and Protect Intellectual Property Act (Pipa), aimed at stopping copyright infringement by foreign websites, would actually disrupt free expression and harm the internet.

The English Wikipedia was blacked out for 24 hours. Readers who came to it could not read the free editable encyclopaedia, but instead were shown messages about Sopa and Pipa and encouraged to contact their representatives to speak out against the Bills.

Wikipedia founder Jimmy Wales

And today the website sported a "thank you" banner at the top of its page, with organisers claiming more than 162 million people had seen the blackout.

Testing

Equation Calculator & Solver -- Algebra.help


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Equation Calculator & Solver

Quick-Start Guide

When you enter an equation into the calculator, the calculator will begin by expanding (simplifying) the problem. Then it will attempt to solve the equation by using one or more of the following: addition, subtraction, division, taking the square root of each side, factoring, and completing the square.

Variables

Any lowercase letter may be used as a variable.

Exponents

Exponents are supported on variables using the ^ (caret) symbol. For example, to express x², enter x^2. Note: exponents must be positive integers, no negatives, decimals, or variables. Exponents may not currently be placed on numbers, brackets, or parentheses.

Parentheses and Brackets

Parentheses ( ) and brackets [ ] may be used to group terms as in a standard equation or expression.

Multiplication, Addition, and Subtraction

For addition and subtraction, use the standard + and - symbols respectively. For multiplication, use the * symbol. A * symbol is not necessiary when multiplying a number by a variable. For instance: 2 * x can also be entered as 2x. Similarly, 2 * (x + 5) can also be entered as 2(x + 5); 2x * (5) can be entered as 2x(5). The * is also optional when multiplying with parentheses, example: (x + 1)(x - 1).

Order of Operations

The calculator follows the standard order of operations taught by most algebra books - Parentheses, Exponents, Multiplication and Division, Addition and Subtraction. The only exception is that division is not currently supported; attempts to use the / symbol will result in an error.