# Scrabble?! INDEFINITES

Is indefinites valid for Scrabble? Words With Friends? Lexulous? WordFeud? Other games?
Yes! (65 pts)
Yes! (52 pts)
Yes! (65 pts)
Yes! (52 pts)
Yes! (65 pts)
Yes! (65 pts)
Yes! (11 pts)
Yes! (65 pts)
Yes! (67 pts)

## Definitions of INDEFINITES in various dictionaries:

In mathematics the indefinite sum operator (also known as the antidifference operator), denoted by ∑ x {\displaystyle \sum _{x}} or Δ − 1 {\displaystyle \Delta ^{-1}} , is the linear operator, inverse of the forward difference operator Δ {\displaystyle \Delta } . It relates to the forward difference operator as the indefinite integral relates to the derivative. Thus Δ ∑ x f ( x ) = f ( x ) . {\displaystyle \Delta \sum _{x}f(x)=f(x)\,.} More explicitly, if ∑ x f ( x ) = F ( x ) {\displaystyle \sum _{x}f(x)=F(x)} , then F ( x + 1 ) − F ( x ) = f ( x ) . {\displaystyle F(x+1)-F(x)=f(x)\,.} If F(x) is a solution of this functional equation for a given f(x), then so is F(x)+C(x) for any periodic function C(x) with period 1. Therefore each indefinite sum actually represents a family of functions. However the solution equal to its Newton series expansion is unique up to an additive constant C. This unique solution can be represented by formal power series form of the antidifference operator: Δ − 1 = 1 e D − 1 {\displaystyle \Delta ^{-1}={\frac {1}{e^{D}-1}}}

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## There are 11 letters in INDEFINITES ( D2E1F4I1N1S1T1 )

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### 2 letters out of INDEFINITES

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