On deck he had overborne my stubborn perplexity by dint of a forced though forceful joviality; in his cabin the gloves were off. View in context Underneath was a man of iron, square-jawed, nervous, forceful.
Delta is a letter of the Greek alphabet with several different mathematical meanings. Learn about the functions of delta, what it looks like, and how you can use delta in your mathematical expressions in this lesson.oth meanings being with the letter D just like the Greek letter, which should help you remember them: 1  Difference is the most common meaning of the uppercase delta. 2  Discriminant is the second most common meaning of the uppercase delta.
The concept of sigma notation means to sum up all terms and uses three parts to form math statements, like âi ai. The Greek letter â is the summation operator and means the sum of all, i is called the index number, and ai refers to a series of terms to be added together.