Update README.md

README.md

@@ -57,12 +57,12 @@ Syntax Summary
 | Syntax  | Operation |
 |:-:|:-:|
 | \| |  Symetric inner product |
+| << |  Left contraction |
 |  ^ | Outer product  |
 | *  |  Geometric product |
 | X\(i\)  |  Return the section of the multivector X of grade i |
 | X\(ei\)  |  Return the section of the multivector X for which ei is the pseudo scalar |
 | X\[i\]  | Return the i'th coefficient from the multivector X
-| X\(ei\)  |  Return the section of the multivector X for which ei is the pseudo scalar |
 | X.normal() | Return the normalised multivector so that X*~X is +- 1 |