03/14/19

#### Union of two vector subspaces not a subspace?

I'm having a difficult time understanding this statement. Can someone please explain with a concrete example?

03/14/19

#### What is the "standard basis" for fields of complex numbers?

What is the "standard basis" for fields of complex numbers?
For example, what is the standard basis for $\\Bbb C^2$ (two-tuples of the form: $(a + bi, c + di)$)? I know the standard for $\\Bbb...
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10/28/15

#### Find the linear approximation of the function f(x) = (1 - x)^1/2 at a = 0 and use it to approximate 0.9^1/2 and 0.99^1/2

Find the linear approximation of the function f(x) = (1 - x)1/2 at a = 0 and use it to approximate 0.91/2 and 0.991/2
I know how to figure this out when I'm allowed to graph it, however, my...
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10/26/15

#### How to solve the derivative of (1/(x+3))+2x using limit as h approaches 0 definition?

lim as h->0 of
(1/(x+3))+2x
derivative definition help?

04/09/15

#### Using the delta-epsilon method, prove that the limit as x approaches 2 of 1/x is equal to 1/2.

When finding delta, use the absolute value of x-2 is less than 2 so that delta=min{2,__}
This is what I've done so far:
f(x)=1/x
L=1/2
a=2
Find delta:
absolute value of...
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