Example of misusing the sign of summation, sigma

This is an example of showing the abuse of the sign of summation, sigma.

Category:

Education

Tags:

• Abuse
• or
• misuse
• the
• sign
• of
• summation
• Mathematics
• Arithmetic
• index
• notation
• natural
• logarithm
• lnx
• is
• log
• having
• base
• Recreational
• Math
• Mathematical
• game
• IQ
• games
• Higher
• order
• thinking
• hierarchy
• intellectual
• skills
• approximate
• e=2.7182818...
• 2d7182818
• English
• and
• Chinese
• versions

[almightysapling]

did you just MAKE UP a new usage for the sum? cuz last time i checked, sigma required limits and a variable of iteration, you can't just throw out that "SIGMA 9" is actually "the sum as i goes from one to nine of i"... this would DEFINITELY be cheating the puzzle, making use of (for starters, an UNLISTED operator and...) the number one, and a variable...

[2d7182818]

Dear almightysapling,

Thank you very much for your kind attention!

You are very careful about the usage of the shorthand of the summation sign, Sigma. This is praiseworthy because the interplay between the question and answer can have much better learning effect than the direct statement of knowledge.

I'm going to show you one of the original message in the internet in the following reply.

[2d7182818]

I've checked the internet about the usage of the sign. There are at least 3 different sources, telling us the usage of SIGMA in my video is still all right.

One of the message writes as follows:

The limits of summation are often understood to mean i = 1 through n. Then the notation below and above the summation sign is omitted. Therefore this expression means sum the values of x, starting at xi and ending with xn.

Thanks for giving me a chance to clarify the correct use of the sign.

[almightysapling]

Okay, but your usage of it is still incorrect. The shorthand method assumes that for "SIGMA X" x is a sequence, and the values added are x1 up to xn [generally, ALL the values]. SIGMA 9 would then assume that 9 was not a number, but the name of a sequence: you are still abusing the use of the sum. I read the articles you linked me too, and I think you misunderstand the shorthand. the shorthand of "Sigma X" is not not "i= 1 to X; SUM of i" but rather "i= 1 to N; SUM of X sub i".