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nuuskur's latest activity
nuuskur
reacted to
chwala's post
in the thread
Prove the given hyperbolic trigonometry equation
with
Like
.
Yeah using ##\sinh^2 \dfrac{x}{2}## is easier...and the appropriate approach...has only 2 lines...will post that later... Using...
Yesterday, 7:57 AM
nuuskur
replied to the thread
Fundamental matrix for complex linear DE system
.
Why is it a problem that eigenvalues are not real? A fundamental matrix of the system is a matrix-valued function ##\Phi## such that the...
Yesterday, 1:56 AM
nuuskur
replied to the thread
Prove the given hyperbolic trigonometry equation
.
Typos in your exponents. Right now you have zero at the very end. Explain the 5th equality from the bottom.
Wednesday, 7:12 AM
nuuskur
replied to the thread
A
Axiom of choice: Replacing a strong condition with a weaker condition
.
Shooting from hip, I'd say choice is not necessary for this to occur. To prove choice, we would have an arbitrary family of nonempty...
Monday, 11:19 AM
nuuskur
reacted to
fresh_42's post
in the thread
Proving differentiability for a function from the definition
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Like
.
Because of the first sentence: Let ##f## be a differentiable function.
Monday, 10:56 AM
nuuskur
replied to the thread
Non-Differentiable Function proof
.
Recall that ## 2\sin^2x = 1-\cos 2x ## and consider the behaviour of ##\frac{\sin t}{t}## as ##t\to 0##.
Monday, 8:50 AM
nuuskur
replied to the thread
True or false problem for double differentiable function
.
Second derivative positive implies ##f## is convex for ##x<a##. Take anything that is convex and decreasing for (some) ##x<a## as...
Monday, 8:48 AM
nuuskur
replied to the thread
I
About the definition of vector space of infinite dimension
.
Existence of Schauder basis implies separable (e.g here)
Sunday, 12:18 PM
nuuskur
reacted to
WWGD's post
in the thread
Collection of Lame Jokes
with
Haha
.
May 8, 2024
nuuskur
reacted to
docnet's post
in the thread
An interesting motorcycle travel blog
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Like
.
Here's a travel blog by a couple from Estonia, who ride their BMW motorcycle 200,000km and to 85 countries around the world. Proper...
May 8, 2024
nuuskur
reacted to
BillTre's post
in the thread
Collection of Lame Jokes
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Love
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May 8, 2024
nuuskur
reacted to
Orodruin's post
in the thread
Collection of Lame Jokes
with
Haha
.
May 8, 2024
nuuskur
reacted to
BillTre's post
in the thread
Collection of Lame Jokes
with
Love
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She's out of this world!
May 8, 2024
nuuskur
reacted to
Borg's post
in the thread
Collection of Lame Jokes
with
Haha
.
Back to our regularly scheduled lame jokes. Barbie is in negotiations to do a sequel involving the Star Wars universe.
May 8, 2024
nuuskur
reacted to
dextercioby's post
in the thread
Collection of Lame Jokes
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Haha
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May 8, 2024
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