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corbettmaths.com
| | jaydaigle.net
4.5 parsecs away

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| | We continue our exploration of what numbers are, and where mathematicians keep finding weird ones. In the first three parts we extended the natural numbers in two ways: algebraically and analytically. Those approaches gave overlapping but distinct sets of numbers. This week we combine them to get the complex numbers, and see some hints of why the complex numbers are so useful-and so frustrating.
| | revisionmaths.com
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| | Trigonometry GCSE Maths Revision section covering: Sin, Cos, Tan, Pythagoras, Sine and Cosine Rule, Similar Triangles and Congruency.
| | www.mathplanet.com
4.7 parsecs away

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| | richardzach.org
27.6 parsecs away

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| The Zeitschrift für mathematische Logik und Grundlagen der Mathematik was one of the few logic journals around in the mid 20th century. It started publishing in 1955, I think the only logic journal...