⇒ is used for material implication i.e. implies; if .. then
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If by "arrow" you mean "carat" (>) the carat means "greater than" and if underlined means "greater than or equal to"
What does length mean in math
Communitive means of, or belonging to, a community. It has no meaning in math. Communative does not mean anything - in math or elsewhere.
the mean is the average
What does > mean?