## timo86m 2 years ago What do the commas mean here. Uploading a pic

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1. timo86m

2. Compassionate

The comma is use in numbers and mathematics to make to numbers easier to read. ( avoid confusion )

3. timo86m

ironic cuzz it is confusing me I understand when it is a pair like x,y but what does it mean in the context of linear algebra?

4. Compassionate

It's just to separate numbers and letters.

5. joemath314159

Generally in linear algebra you need a double index to denote the row and column youre in (in reference to some matrix). Thats what those commas look like they are doing to me. \[a_{i,j}\]means the element in the i-th row, j-th column.

6. timo86m

|dw:1361767170915:dw|

7. timo86m

ok at first i didn't see it as subscripts. That sucks. I cant tell.

8. timo86m

I could havve told if i'd realize it subscripts. The book sucks.

9. Compassionate

Actually, there is more of a context. Sometimes it denotes subscripts, however, it can also denote points on a parabola. In general, it is to separate quantities (e.g terms from their subscripts.)

10. abb0t

thurs letturs in math?!?!!?!?

11. timo86m

ok that clears a lil confusion thanks :)

12. timo86m

|dw:1361767590009:dw|

13. timo86m

row by colum i,j So |dw:1361767828250:dw| that would be? |dw:1361767875622:dw| right?

14. joemath314159

1st row, second column would be the 4.

15. timo86m

aaa ok sorry my mind is not working right just now lol.

16. timo86m

aaaa ok i think i get it now thank you :D BTW I am doing this on my own. Not a class or anything. Just wanna study linear algebra Downloaded this book and am reading it http://joshua.smcvt.edu/linearalgebra/ Bearly on page 24

17. timo86m

I finally rented an actual book gonna give that a read instead