Line 9:
Line 9:
=== Rank ===
=== Rank ===
−
This only works however when the ingredients are full rank, that is no ingredient can be defined as a sum of other ingredients. An added complexity is that one has to determine the [https://en.wikipedia.org/wiki/Nonnegative_rank_(linear_algebra) non-negative rank] to be sure of this.
+
This only works however when the ingredients are full rank, that is no ingredient can be defined as a sum of other ingredients. An added complexity is that one has to determine the [https://en.wikipedia.org/wiki/Nonnegative_rank_(linear_algebra) non-negative rank] to be sure of this. (Can not find an application that calculates this).
If the ingredients are NOT full rank, the product becomes underdetermined.
If the ingredients are NOT full rank, the product becomes underdetermined.