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Answers

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Lower bound of the number of relatively primes(each-other) in an interval

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Smallest integer not divisible by integers in a finite set

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Erik Westzynthius’s cool upper bound argument: update?

5

Applications of mathematics

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How to/Can you get a PhD position when you need more experience first?

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Mathematics TV clips

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Partitioning the integers $1$ through $n$ so that the product of the elements in one set is equal to the sum of the elements in the other

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Why semigroups could be important?

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is there any efficient way to compute the follow matrix equations easily

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About Turan`s problem(inequality) in multivariable

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Is there a reason why integrals are so much easier to evaluate than sums?

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How many relations of length $n$ can exists in a group without enforcing shorter relations?

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Diophantine problem

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Lower bound for sum of binomial coefficients?

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partitioning a number into two sets based on sum of digits

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Prime factorization of n+1

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Advice on Giving a Talk

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Angles in an integral lattice

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Open problems in Euclidean geometry ?

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Does any research mathematics involve solving functional equations?

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Is there more than 1 way to make a 17-node graph such that there are no 4-cycles and each node has at least four edges?

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What sums of equal powers of consecutive natural numbers are powers of the same order?

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Graduate School

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Of what kind of complemented bounded poset are the structures in my quasi-variety?

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Conjecture on signed sum of integer fractions x/y from 1..N?

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Consecutive numbers with n prime factors

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Adjacency matrices of graphs

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Equational logic

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Smallest prime that does not divide the Vandermonde determinant

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Computer Science for Mathematicians