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Significant figures (also known as the significant digits, precision or resolution) of a number in positional notation are digits in the number that are reliable and necessary to indicate the quantity of something. If a number expressing the result of a measurement (e.g., length, pressure, volume, or mass) has more digits than the number of digits allowed by the measurement resolution, then only as many digits as allowed by the measurement resolution are reliable, and so only these can be significant figures.

Significant Figures - Wikipedia

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Philip was fortunate to be assigned to the household of the Theban general Pammenes, who was a great friend of Epaminondas, the victor of Leuctra. While the other Macedonian hostages feasted and chased local girls, Philip spent every moment learning the latest techniques in warfare from the Theban generals. The Macedonian army before Philip’s time consisted of a peasant infantry led by undisciplined nobles on horseback. Like their counterparts in the Middle Ages, these Macedonian knights saw themselves as the epitome of heroic warfare and treated the lowly farmers and shepherds in the infantry as so much fodder for enemy spears. But Philip discovered a very different kind of army at Thebes.

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