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copy
The copy notation is typically placed at the bottom of a letter or document, just below the signature block. It indicates that copies of the document have been sent to additional recipients. In attachments or enclosures, the notation can also be included on the first page or as a separate note, specifying the names and titles of those receiving copies. This helps ensure that all relevant parties are informed.
Leonhard Euler is the king of mathematics, even he was blind !Euler introduced much of the mathematical notation in use today, such as the notation f(x) to describe a function and the modern notation for the trigonometric functions. He was the first to use the letter e for the base of the natural logarithm, now also known as Euler's number. The use of the Greek letter π to denote the ratio of a circle's circumference to its diameter was also popularized by Euler (although it did not originate with him).[1] He is also credited for inventing the notation i to denote .[2]I salute him.
in algbraic notation squares are named by combining the letter or their file with the number of their rank
Attachment notation is something at the end of a letter or memo that lets the reader know that there is something else other than the letter or memo.