1 Tuples
- Tuples are a new data type: sequences with spin. A tuple can be either spin-up or spin-down.
- A pair of compatible tuples can be contracted into a single number.
- Tuples are compatible if they have the same length and opposite
spin, and if their corresponding pairs of items are either both
numbers or both compatible tuples.
- To contract tuples, take the sum of the products of corresponding
pairs of items. (To take the product of compatible tuples,
contract them.)
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Date: 2011-08-10 14:07:53 EDT
Author: Robert McIntyre
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