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Answers
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ratio of triangular numbers
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Are there uncountably many cube-free infinite binary words?
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How much linear algebra can be done with graphs?
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The odd power of copositive matrix
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Ax–Grothendieck and the Garden of Eden
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What are the possible sets of degrees of irreducible polynomials over a field?
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Your favorite surprising connections in Mathematics
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What are the Applications of Hypergraphs
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Convergence of the sum of squares of averages of a sequence whose sum of squares is convergent
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What was Galois theory like before Emil Artin?
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Sign-Gordon Equation
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The Wronskian of sin(kx) and cos(kx), k=1…n
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Alternating sums of alternate Stirling numbers
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Can continuity of a function be checked by restricting to smooth curves?
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A graded ring $R$ is graded-local iff $R_0$ is a local ring?
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determinants and polynomials in matrices
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Are two elements of a group determined up to simultaneous conjugacy by the conjugacy classes of all of their products?
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Can a harmonic number be a rational number for non-integer rational argument?
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A “known” Pythagorean identity in algebra?
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Is there a standard name for the intersection of all maximal linearly independent subsets of a given set in a vector space?
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Higher-dimensional Catalan numbers?
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Repetitions of the totient
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$\kappa$-coloring of $\mathbb{R}^2$ and triangle with area 1
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An n!xn! determinant.
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An inequality relating the factorial to the primorial.
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Generalizations of “standard” calculus
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Packing moebius bands
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form of primes:prime plus a power of 2?
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Weak form of the $abc$-conjecture?
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Importance of large gaps between zeros of zeta function?
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