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The first guinea was produced on 6 February 1663 (361 years ago) (); a proclamation of 27 March 1663 made the coins legal currency.One troy pound of 11 ⁄ 12 (0.9133) [citation needed] fine gold (22 carat or 0.9167 pure by weight) would make 44 + 1 ⁄ 2 guineas, [5] each thus theoretically weighing 129.438 grains (8.385 grams crown gold, 7.688 grams fine gold, or 0.247191011 ozt (troy ounces ...
Ice is water that is frozen into a solid state, typically forming at or below temperatures of 0 °C, 32 °F, or 273.15 K.It occurs naturally on Earth, on other planets, in Oort cloud objects, and as interstellar ice.
The name peso was given to the 8-real silver coin introduced in 1497, minted at 8 3 ⁄ 8 pesos to a Castilian mark (230.0465 grams) of silver 134/144 fine (25.56 g fine silver).
A substantial fraction of the water supply for some regions consists of water extracted from water stored in stocks, and when withdrawals exceed recharge, stocks decrease. By some estimates, as much as 30 percent of total water used for irrigation comes from unsustainable withdrawals of groundwater, causing groundwater depletion .
Water (H 2 O) is a polar inorganic compound that is at room temperature a tasteless and odorless liquid, which is nearly colorless apart from an inherent hint of blue.It is by far the most studied chemical compound [20] and is described as the "universal solvent" [21] and the "solvent of life". [22]
Millesimal fineness is a system of denoting the purity of platinum, gold and silver alloys by parts per thousand of pure metal by mass in the alloy. For example, an alloy containing 75% gold is denoted as "750".
The matrix D = B −1 C has nonnegative entries if represents a regular splitting of A. [2]It can be shown that if A −1 > 0, then () < 1, where () represents the spectral radius of D, and thus D is a convergent matrix.
The second, or default case x -> 1 matches the pattern x against the argument and returns 1.This case is used only if the matching failed in the first case. The first, or special case matches against any compound, such as a non-empty list, or pair.