Showing posts with label
John Wallis
.
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Showing posts with label
John Wallis
.
Show all posts
Wednesday, November 23, 2016
Born today...John Wallis, November 23, 1616, Ashford, United Kingdom. Mathematician and cryptographer who introduce the infinity symbol in 1655 in his De sectionibus conicis. image: Pamela Colman Smith (1878 – 1951) illustration from the Waite Tarot
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