# Don't understand a specific notation

#### Nielsz

##### Member
Hi,

I'm trying to learn this method: http://grrroux.free.fr/method/Step_3.html

One step says: (R'DR'DR')U(R'DR'DR')'

I understand, R, R' and so on, but I don't understand the last one.
Should I repeat the whole sequence "negatived"? Or reverse the whole sequence, or just untill the last ( ?

#### Athefre

##### Member
When I first started learning Roux, I had the same problem.

First you do:

(R'DR'DR')U

Then:

(R'DR'DR')'

Which means do all of the stuff in parentheses backwards, which turns into RD'RD'R since the last parentheses has a ' after it. It's just like algebra.

Vim

#### Nielsz

##### Member
Originally posted by Athefre@Dec 6 2006, 10:33 PM
When I first started learning Roux, I had the same problem.

First you do:

(R'DR'DR')U

Then:

(R'DR'DR')'

Which means do all of the stuff in parentheses backwards, which turns into RD'RD'R since the last parentheses has a ' after it. It's just like algebra.
Ah, obvious.

R'DR'DR' U RD'RD'R

Should be the whole sequence.
Thanks!

#### BruuD

##### Member
Originally posted by Athefre@Dec 6 2006, 09:33 PM
First you do:

(R'DR'DR')U

Then:

(R'DR'DR')'

Which means do all of the stuff in parentheses backwards, which turns into RD'RD'R since the last parentheses has a ' after it. It's just like algebra.
Why don't they just write it down in the right order then?
If (R'DR'DR')' is actually RD'RD'R, why don't they just write down "RD'RD'R" ?

btw, 1st post, I R cube n00b :blink: