What does “e” in “1e-5” in Python language mean and what is the name of this notation?

Question

I notice that there is such an expression "1e-5" in Python(probably in other languages also)

1. What is the name of this notation?

2. what does it denote in math?

3. What does 'e' mean? It's the first time I see a character helps to denote some value, are there other characters also help do so?

4. Why should we use this way instead of some other python math operation like pow() etc?

Answer 1

It is nothing but a scientific notation. It means that 1 × 10−5. In other words, 0.00001.

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Answer 2

The meaning of e in python is 10 ** -5, i.e. 10 to the power of negative 5, 1 divided by 10 to the power of 5, or 0.00001.

Answer 3

Scientific notation or exponential notation is called the notation "1e-5," a notation used to express numbers very large or very small with powers of ten; for instance, 1 x 10^(-5). Here, the 'e' stands for "exponent," that is, the power of ten, and it often is used in combination with other characters, such as 'E' or 'x,' depending on the programming language being used. Scientific notation is used in this problem to make reading easier and to reduce complicated computations, especially when one encounters extreme values. Although such functions as `pow()` may be helpful for special purposes of exponentiation, scientific notation provides a precise, compact representation of the numbers. So in simple 1e-5 represents 1 x 10 ^ (-5)