I think "m*n" & "1*s" (or "m×n" & "1×s") may be clearer. I read "mXn" & "1Xs" firstly as variable names.
Tell me the slope
Make one big string out of two smaller strings
Determine Whether an array is empty
Find nth maximum
Approximate the cosine function
Sum of Two Numbers
Find the largest number
Separate even from odd numbers in a vector - without loops
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