If I have some function whose time complexity is O(mn), where m and n are the sizes of its two inputs, would we call its time complexity linear (since it's linear in both m and n) or quadratic (since it's a product of two sizes)? Or something else?I feel calling it linear is confusing because O(m + n) is also linear but much faster, but I feel like calling it quadratic is also weird because it's linear in each variable separately.
Is O(mn) considered linear or quadratic growth?
terminology;asymptotics;landau notation