In algebra, a binary operation is a rule for combining the elements of a set two at a time. In most important examples that combination is also another member of the same set. Addition, subtraction, multiplication, and division are familiar binary...

In mathematics, associativity is a property that a binary operation can have. It means that, within an expression containing two or more of the same associative operators in a row, the order of operations does not matter as long as the sequence of the...

Rep. Tom Davis, R-Va., senior Republican, House Committee on Oversight and Government Reform.Earned income: $165,200.Honoraria, all donated to charity: None.Major assets: Property partnership in Virginia Beach, $100,001-$250,000; more than 30 investments, mainly mutual funds and certificates of deposit, the largest a CD worth $100,001-$250,000.Major sources...

The Politico's Daniel Kunitz, associate publisher and managing editor for the web, has left the paper. According to a memo sent to staff late this afternoon, Mr. Kunitz does not yet know where he is headed next. He will continue to help out with various...

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The World Toilet Association kicked off its inaugural conference Thursday, hoping to spark a sanitation revolution that will save lives through better hygiene and break taboos about what happens behind closed bathroom doors.To the celebratory rhythms of a percussionist beating on toilets, dozens of government...