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?
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