# Scrabble?! CONTRACTIVE

Is contractive valid for Scrabble? Words With Friends? Lexulous? WordFeud? Other games?
Yes! (68 pts)
Yes! (57 pts)
Yes! (68 pts)
Yes! (57 pts)
Yes! (68 pts)
Yes! (70 pts)
Yes! (11 pts)
Yes! (68 pts)
Yes! (71 pts)

## Definitions of CONTRACTIVE in various dictionaries:

In mathematics, a contraction mapping, or contraction or contractor, on a metric space (M,d) is a function f from M to itself, with the property that there is some nonnegative real number 0 ≤ k < 1 {\displaystyle 0\leq k<1} such that for all x and y in M, d ( f ( x ) , f ( y ) ) ≤ k d ( x , y ) . {\displaystyle d(f(x),f(y))\leq k\,d(x,y).} The smallest such value of k is called the Lipschitz constant of f. Contractive maps are sometimes called Lipschitzian maps. If the above condition is instead satisfied for k ≤ 1, then the mapping is said to be a non-expansive map. More generally, the idea of a contractive mapping can be defined for maps between metric spaces. Thus, if (M,d) and (N,d') are two metric spaces, then f : M → N {\displaystyle f:M\rightarrow N} is a contractive mapping if there is a constant k < 1 {\displaystyle k<1} such that d ′ ( f ( x ) , f ( y ) ) ≤ k d ( x , y ) {\displaystyle d'(f(x),f(y))\leq k\,d(x,y)} for all x and y in M. Every contraction mapping is Lipschitz continuous and hence uniformly continuous (for a Lipschitz continuous function, the constant k is no longer necessarily less than 1). A contraction mapping has at most one fixed point. Moreover, the Banach fixed-point theorem states that every contraction mapping on a nonempty complete metric space has a unique fixed point, and that for any x in M the iterated function sequence x, f (x), f (f (x)), f (f (f (x))), ... converges to the fixed point. This concept is very useful for iterated function systems where contraction mappings are often used. Banach's fixed-point theorem is also applied in proving the existence of solutions of ordinary differential equations, and is used in one proof of the inverse function theorem.Contraction mapping plays an important role in dynamic programming problems.

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## There are 11 letters in CONTRACTIVE ( A1C3E1I1N1O1R1T1V4 )

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### 2 letters out of CONTRACTIVE

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