Usually, yes.
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Variables are usually writen as lower-case letters.Variables are usually written as letters, (x, y, z, etc.) or as Greek letters (theta, lambda, mu, etc.).
It is usually the regression coefficient: a measure of the degree to which two variables change in agreement with one another.
Not sure how the upper case and lower case letters interact. If that can be ignored then rj.Not sure how the upper case and lower case letters interact. If that can be ignored then rj.Not sure how the upper case and lower case letters interact. If that can be ignored then rj.Not sure how the upper case and lower case letters interact. If that can be ignored then rj.
As written in lower case in this font (as waist), 2: the letters w and iIf written in upper case in this font (as WAIST), 4: the letters W, A, I and T
identifying any upper or lower bounds on the decision variables