Christmas purchase

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it’s A 18 letters crossword definition.
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Possible Answers:

TREE.

Last seen on: Universal Crossword – Mar 8 2021

Random information on the term “TREE”:

In mathematical logic, the Paris–Harrington theorem states that a certain combinatorial principle in Ramsey theory, namely the strengthened finite Ramsey theorem, is true, but not provable in Peano arithmetic. This has been described by some (such as the editor of the Handbook of Mathematical Logic in the references below) as the first “natural” example of a true statement about the integers that could be stated in the language of arithmetic, but not proved in Peano arithmetic; it was already known that such statements existed by Gödel’s first incompleteness theorem.

The strengthened finite Ramsey theorem is a statement about colorings and natural numbers and states that:

Without the condition that the number of elements of Y is at least the smallest element of Y, this is a corollary of the finite Ramsey theorem in K P n ( S ) {\displaystyle K_{{\mathcal {P}}_{n}(S)}} , with N given by:

TREE on Wikipedia