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-   -   plus-minus before a (for example, square-root) (http://mymathforum.com/abstract-algebra/345915-plus-minus-before-example-square-root.html)

shaharhada March 8th, 2019 04:08 AM

plus-minus before a (for example, square-root)
 
"The paper 'bear' everything"

Are there examples in abstract math that we cannot put plus-minus sign before a root?
For example, when we calculating the solutions of quadratic equation we use the sign. So, when we don't use it in the Realm of Abstract Algebra?

v8archie March 8th, 2019 06:33 AM

Any time we don't want to say "plus or minus".

shaharhada March 8th, 2019 06:43 AM

response
 
Quote:

Originally Posted by v8archie (Post 606601)
Any time we don't want to say "plus or minus".

So every question in Abstract Algebra can always can plus or minus and there are no question that if it is not mentioned exactly what the want?
(2) So, there also not hints in Abstract Algebra Realm, so you can see that you can only use only plus or only minus? (I mentioned it cannot be seem in explicit instruction of the question)?

topsquark March 8th, 2019 08:26 AM

Quote:

Originally Posted by shaharhada (Post 606602)
So every question in Abstract Algebra can always can plus or minus and there are no question that if it is not mentioned exactly what the want?
(2) So, there also not hints in Abstract Algebra Realm, so you can see that you can only use only plus or only minus? (I mentioned it cannot be seem in explicit instruction of the question)?

Typically in Abstract Algebra (to my limited knowledge) if we have a quadratic that needs to be solved and the roots used for something then we simply say that the roots are $\displaystyle r_1$ and $\displaystyle r_2$. I've only rarely seen plus or minus notation to be needed.

-Dan


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