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Of those three things, the issue you most identify with is the one they represent

This story is produced in partnership with The Examination , a nonprofit newsroom that investigates global health threats, the Organized Crime and Corruption Reporting Project , The New Arab , and Zawia3

Before a vowel, as in equal , equality , or equi before a consonant as in equidistant , equilibrium = (Equal) : One of the best-known notations in mathematics, it was probably invented in 1543 by Robert Recorde , and English writer, who became tired of repeating the phrase is equalle to: and decided to represent it using two parallel, straight lines that he considered to be visually equal