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2

Which mathematical ideas have done most to change history?

1

Counterexamples in Algebra?

6

Status of the Hadamard Circulant conjecture

4

Names of finite groups

1

Topics for an Undergraduate Expository Paper in Number Theory

8

Instances where an existence result precedes the constructive version

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cospectral graphs

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Is there an infinite number of combinatorial designs with $r=\lambda^{2}$