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 Apr22 comment How do I express, algebraically, this comparison of two sets of sets? I meant $|A1|+|A2|+|A3|$. But, yes, the sets are disjoint. Also, as there always be 3 subsets, I will probably choose to represent $J$ as $3$. Apr22 accepted How do I express, algebraically, this comparison of two sets of sets? Apr22 comment How do I express, algebraically, this comparison of two sets of sets? Thanks @goblin. I think I want $\sum_{j:J}|A_j|$ as the denominator. Is the ambiguity in my question related to the $+$ symbols in the denominators of the example? Apr22 comment How do I express, algebraically, this comparison of two sets of sets? @GA316 I mean the combined length of $A_1$, $A_2$ and $A_3$ (=6). I'm not sure of the correct representation at the moment. Apr22 revised How do I express, algebraically, this comparison of two sets of sets? deleted 6 characters in body Apr22 revised How do I express, algebraically, this comparison of two sets of sets? deleted 6 characters in body Apr22 revised How do I express, algebraically, this comparison of two sets of sets? added 6 characters in body Apr21 revised How do I express, algebraically, this comparison of two sets of sets? deleted 73 characters in body Apr21 asked How do I express, algebraically, this comparison of two sets of sets? Dec31 awarded Popular Question May30 awarded Tumbleweed May23 asked Comparison of two matrix multiplication operations. Mar14 comment How can I create a subset of the 'most dissimilar' combinations from a set of possible combinations? @Fei Gao - Yes that seems to be a good match. Thanks. Mar13 revised How can I create a subset of the 'most dissimilar' combinations from a set of possible combinations? added 7 characters in body Mar13 asked How can I create a subset of the 'most dissimilar' combinations from a set of possible combinations? Jul29 awarded Benefactor Jul29 accepted Differentiate a function containing a variable and its complex conjugate Jul22 comment Differentiate a function containing a variable and its complex conjugate Thanks, I am struggling to understand why it makes no sense at present. Any pointers much appreciated. Jul22 revised Differentiate a function containing a variable and its complex conjugate edited body Jul16 comment Differentiate a function containing a variable and its complex conjugate Thanks, I need to do some reading!