John Napier invented logarithm in:

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John Napier invented logarithm in: Answer: 1614

John Napier invented logarithms and published his groundbreaking work, Mirifici Logarithmorum Canonis Descriptio, in 1614, a discovery that drastically simplified complex scientific calculations and earned him a lasting legacy in mathematics, notes Taylor & Francis Online, Encyclopedia Britannica https://www.britannica.com/biography/John-Napier, and Mathematical Association of America (MAA).