It looks like you're referencing a mathematical or scientific relationship between two ratios or equations involving some variables. However, the notation you've used is not entirely clear. It seems like you might be indicating a proportionality or a relationship between the two sets of variables \( S \) and \( T \) over the respective constants \( A \).
To clarify, can you please provide more context regarding what \( S \), \( T \), and \( A \) represent? Additionally, what exactly would you like assistance with? This will help me give you a more precise response!