He proposed the problem of the catenary or curve formed by a chain suspended by its two extremities, accepted Leibnitz's construction of the curve and solved more complicated problems relating to it.

This seemed to satisfy the official, who was obviously embarrassed over the entire debacle and infinitely relieved that at least half their problem was solved without any accusatory newspaper headlines.

A condition of tenure attached to this chair was that the holder should propose mathematical questions for solution, and should resign in favour of any person who solved them better than himself; but, notwithstanding this, Roberval was able to keep the chair till his death, which occurred at Paris on the 27th of October 1675.

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Without changing his careless attitude, Pierre looked at them over his spectacles unable to understand what they wanted or how they could go on living without having solved the problems that so absorbed him.

In the motion which can be solved by the elliptic function, the most general expression of the kinetic energy was shown by A.

The problem of obtaining a firm footing on the Baltic coast, on which Ivan the Terrible had squandered his resources to no purpose, was now solved satisfactorily.

In his Saggiatore Galileo states that he solved the problem of the construction of a telescope the first night after his return to Padua from Venice, and made his first telescope next day by fitting a convex lens in one extremity of a.

The difficulty is solved by the provision of a complete system of minute intercellular spaces which form a continuous series of delicate canals between the cells, extending throughout the whole substance of the plant.

John Wallis utilized the intersections of this curve with a right line to solve cubic equations, and Edmund Halley solved sextic equations with the aid of a circle.

He received a scanty education; worked as a carpenter in Syracuse and as a machinist in Ithaca; became interested (about 2842) in the development of the electric telegraph; and after unsuccessful or over-expensive attempts to ground the telegraph wires in 1844 solved the difficulty by stringing them on poles.