Related papers: An Elementary Proof for Ljunggren Equation
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In this article using elementary school level Geometry we observe an alternative proof of Pythagorean Theorem from Heron's Formula.
Recently, Straub gave an interesting $q$-analogue of a binomial congruence of Ljunggren. In this note we give an inductive proof of his result.
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I give simple elementary proofs for some well-known Hankel determinants and their q-analogues.
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