**Mathematics**

- Open problem, a well-defined problem with no known solution in science and mathematics
- Open set, set in topology and related fields of mathematics
- Opening (morphology), an operator in mathematical morphology
- Open map, a function that is open

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### Famous quotes containing the word mathematics:

“I must study politics and war that my sons may have liberty to study *mathematics* and philosophy.”

—John Adams (1735–1826)

“It is a monstrous thing to force a child to learn Latin or Greek or *mathematics* on the ground that they are an indispensable gymnastic for the mental powers. It would be monstrous even if it were true.”

—George Bernard Shaw (1856–1950)