The most perplexing part of the formula, though, is the first portion of the lower part of the equation where the Greek letter "e" (for epsilon) is multiplied by the letter phi. Both of these ...

The most perplexing part of the formula, though, is the first portion of the lower part of the equation where the Greek letter "e" (for epsilon) is multiplied by the letter phi. Both of these Greek ...

The White House shared a formula containing symbols like epsilon and phi—but critics pointed out they served no purpose. Trump’s tariff formula has fancy Greek symbols. No one is sure why ...