Face recognition using PCA solution :D 11951

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Recursive Grammars can look like this : 

Digit -> 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
Sign -> + | -
Integer -> (sign) Digit {Digit}
Float -> Integer (. (Integer))
EFloat -> Float E Integer

Define your symbols… 

{} = zero or more instances of this
() = one optional instance of this

Then use the pieces to build formulae

Expression = Integer
Expression = Float
Expression = Expression * Expression
Expression = Expression + Expression
Expression = Expression - Expression
Expression = Expression / Expression
...
Expression = ( Expression )

Depending on how you build things you get various grammar. The one above is an example and (hopefully) clearly contains mistakes.

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