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What is the detailed meaning of the symbol (a bit like e) for the sum of series, and what are the meanings of several angles?
Let me type this summation symbol for you: ∑.

Let me explain. It is generally written as i= 1, which means to sum from 1.

It's usually n, which means sum to n.

It will be more helpful for your understanding to give a concrete example.

For example, ∑(ai) (subscript is i= 1 with n on it), then the result is:

a 1+a2+a3+…+an

Take another example ∑ (a I) (subscript is i=5, and above it is 10), then the result is:

a^5+a^6+a^7+a^8+a^9+a^ 10.

Now you should understand, right? If you don't understand anything, please continue to ask me questions through SMS. I am a teacher, and I will have the patience and experience to answer any questions you ask. Thank you.