Encountering Problems with Near Vision after 40. If you have never needed eyeglasses or contact lenses to correct distance vision, then experiencing near vision problems after age 40 can be concerning and frustrating. You may feel like you've abruptly lost the ability to read the newspaper or see the cell phone numbers.
A system of symbols used to represent special things. Example: In mathematical notation â means infinity.
What do math symbols mean? A: Symbols are used in all branches of math to represent a formula or procedure, express a condition or to denote a constant. The four basic operations are denoted by the following symbols: â+â implies addition, â-â implies subtraction, âxâ implies multiplication, and â/â implies division.