Sigma notation

9/14/2013

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21 Comments

james

9/16/2013 10:04:20 am

why the set of sigma notation looks so difficult ?

Mr. E

9/16/2013 10:46:02 am

James,
Are you saying it only looks difficult? Or it is difficult? Were you able to understand the concept behind sigma?

Sarafina

9/16/2013 10:26:59 am

The sigma notation is easy to understand but the only difficulty is alternating the signs from postive to negative.

Mr. E

9/16/2013 10:41:30 am

Sarafina,
Basically to get the signs to alternate you have to multiply by (-1)^n.
Think about it:
(-1)^1= -1
(-1)^2= +1
(-1)^3= -1
(-1)^4= +1

and the pattern will just repeat.

Denzel

9/16/2013 10:36:05 am

So basically its like geometric and arithmetic combine almost?

Mr. E

9/16/2013 10:44:39 am

Denzel,
Yes, some summations may be performed on arithmetic or geometric sequences but this need not always be the case.

Jurgen Bushka

9/16/2013 10:55:06 am

I understand what were doing but I'm just confused on how we're substituting, like example 2 confused me with all those exponents and the negatives and positives

Mr. E

9/16/2013 11:35:02 am

Jurgen,
Have you tried replaying example 2 and watching it again? Try it, it may help. If not we will look into it more tomorrow.

Sanjay

9/16/2013 11:25:04 am

This is easy to understand some what but i need practice

Mr. E

9/16/2013 11:35:42 am

Sanjay,
Great! I look forward to practicing more with you all tomorrow.

Olufemi Obaweya

9/16/2013 11:59:40 am

this is easy

olufemi

9/16/2013 12:18:14 pm

the ec is n=-2

olufemi

9/16/2013 12:22:39 pm

i mean n=-3

Marawan Magid

9/16/2013 12:39:28 pm

I get it all , I like this new way of learning

Daler Gilyazov

9/17/2013 09:55:40 am

I basically get it all, but extra credit got me really thinking, need your help explaining it to me

Markenzie Jean

9/30/2013 01:49:46 pm

Sigma Notations make things much easier to understand than normal.

Robin Cepeda

10/2/2013 10:59:59 pm

i understand some.. im confuse

Kaseem Johnson

10/8/2013 06:51:59 am

I understand this topic

donte

10/9/2013 04:25:19 pm

At first that big E looked hard but then u broke down the stels of each piece and then I undeestood it better

justin

10/10/2013 09:44:05 am

i understand it more better

Francisco

10/13/2013 06:53:29 am

Understood

Sigma notation

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