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<p>and proved the triangular case of the <a href="page.php?w=Fermat_polygonal_number_theorem">Fermat polygonal number theorem</a>. He also contributed to the theory of binary and ternary quadratic forms, and the theory of <a href="page.php?w=Hypergeometric_function">hypergeometric series</a>. When Gauss was only 19 years old, he proved the construction of the <a href="page.php?w=heptadecagon">heptadecagon</a>, the first progress in regular polygon construction in over 2000 years. He also introduced the concept of <a href="page.php?w=Gaussian_curvature">Gaussian curvature</a></p><p>
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