The act or process of equating or of being equated. 7 2 10 1. Here we have an equation that says 4x 7 equals 5 and all its parts.
7 2 10 1.
That is the definition of functions that were going to use and will probably be easier to decipher just what it means. So people can talk about equations there are names for different parts better than saying that thingy there. The number e also known as Eulers number is a mathematical constant approximately equal to 271828 and can be characterized in many ways. Back them up with references or personal experience.