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Francois Viete used the words to symbolize unknowns and constants in algebraic equations in "sum obra In artem analyticam isagoge".
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Henricus Grammateus publish the first printed work that uses the symbols + and - to represent addition and subtraction.
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Johannes Kepler discovers one of his Platonic solids, the small dodecahedron that consists of taking a dodecahedron and instead of taking the pentagon, we raise in each edge an equilateral triangle and we join all the triangles of a face.
Plan projects on a visual timeline
Map milestones, phases, deadlines, and key events in one place so the sequence is easier to see and share. Timetoast is a timeline maker for work, school, research, and stories.