98
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COMBINATORICS
2004
15 years 1 months ago
2004
Let (a1, a2,
120
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BIRTHDAY
2008
Springer
15 years 2 months ago
2008
Springer
Abstract. A formula ψ(Y ) is a selector for a formula ϕ(Y ) in a structure M if there exists a unique Y that satisfies ψ in M and this Y also satisfies ϕ. A formula ψ(X, Y )...