Professor Raúl Rojas has published a book about how symbols have been used throughout history in mathematics. The work was translated into English this year.

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I AM glad to see that attention is being forcibly drawn to the value and importance of considering the symbols in physical equations as primarily denoting quantities, and not mere numerical multiples ...

Microsoft Excel allows you to perform equations in individual cells in your worksheet. The Microsoft Equation Editor contains many symbols and operators not commonly found on your keyboard. This ...