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Convergence articles

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This is a translation of an article of Leonhard Euler in which he attempts to prove the fundamental theorem of algebra. In addition, he discusses in detail his understanding of the nature of complex numbers.
I found a stone but did not weigh it; after I added to it 1/7 of its weight and then 1/11 of this new weight, I weighed the total at 1 mina. What was the weight of the stone?
A creative expression combining text, design and illustrations, originally designed for the International Congress of Mathematicians in Madrid.
A sketch of the history of topology, beginning with the polyhedron formula, but continuing up to the present.
Find a number having remainder 29 when divided by 30 and remainder 3 when divided by 4.
What is the perpendicular height of a cloud when its angles of elevation were 35 degrees and 64 degrees as taken by two observers at the same time...
When knowing the sum of their ages along with another equation, determine how old a father and son are.
An introduction to the priority dispute between Euler and D'Alembert relating to several mathematical ideas that both worked on in the 1740s and 1750s.
I owe a man the following notes: one of $800 due May 16; one of $660 due on July 1; one of $940 due Sept. 29. He wishes to exchange them for two notes of $1200 each and wants one to fall due June 1. When should the other be due?
What number which being increased by 1/2, 1/3, and 1/4 of itself, the sum shall be 75?