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FactChecker's latest activity
FactChecker
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Equation that is defined as an identity
.
No. It means that any value of ##x## will work. No matter what value you set for ##x##, you always have 0 = 0.
Today, 1:13 PM
FactChecker
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Office_Shredder's post
in the thread
Finding where a function is sign definite, sign indefinite or sign semidefinite
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What is the definition of sign definite/semi definite/indefinite?
Thursday, 10:18 AM
FactChecker
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jedishrfu's post
in the thread
I
Probability of passing a disease down to a child or a group of siblings?
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I hope this is purely an academic question as we shouldn't rely on answers from random forums to decide whether we should have kids for...
Wednesday, 11:37 PM
FactChecker
replied to the thread
I
Probability of passing a disease down to a child or a group of siblings?
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Close, but not exact. Assume that the odds of each child is independent from the other. Then the probability of neither child being sick...
Wednesday, 6:39 PM
FactChecker
replied to the thread
I
Probability of passing a disease down to a child or a group of siblings?
.
1.2 is 24% of 5, not 6%. This is not a physics or math question.
Wednesday, 2:02 PM
FactChecker
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Orodruin's post
in the thread
B
Are some objects in the night sky just older images of other objects?
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Gravitational lensing is generally not that strong. If you have an object directly behind a large mass however, you can get several...
Wednesday, 12:54 PM
FactChecker
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Dale's post
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Observational Studies: What to Believe
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I must admit that I don’t know anything about specification curve analysis. There are a lot of other statistical tools for addressing...
Tuesday, 11:58 PM
FactChecker
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Orodruin's post
in the thread
Taylor's Theorem for finding error for Taylor expansion
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To add to the above, the entire point of that problem is to demonstrate how Taylor's theorem works. Yes, it is a known function and you...
Tuesday, 11:49 PM
FactChecker
replied to the thread
Taylor's Theorem for finding error for Taylor expansion
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This is an exercise to learn how to use Taylor's Theorem in a familiar situation where ##\sqrt 8## is known and easily obtainable with...
Tuesday, 10:42 AM
FactChecker
reacted to
Office_Shredder's post
in the thread
Ratio test proof
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A good starting point is to compare it to a geometric series. For example if ##c=1/3## can you think of a series that converges whose...
Monday, 10:17 AM
FactChecker
replied to the thread
Find f s. t. ||f||=1 and f(x) < 1 with ||x||=1
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Sorry. I didn't see that you already had a similar example for what you call Case #2. I thought that you were trying to prove that was...
Sunday, 9:09 AM
FactChecker
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marcusl's post
in the thread
I
What branch of electrical engineering uses a lot of probability?
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+1 for Wozencraft and Jacobs. I also suggest that you look into information theory, which uses probability theory heavily and which is...
May 25, 2024
FactChecker
replied to the thread
Find f s. t. ||f||=1 and f(x) < 1 with ||x||=1
.
Consider ##f(y) = 1-y^2## and set ##y \equiv |x|##. It will have its maximum at ##x=0## and equal 0 if ##|x| = 1##.
May 25, 2024
FactChecker
reacted to
gwnorth's post
in the thread
Should I double up on math courses next school year?
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Class is class. You don't have to "vibe" with your classmates. You're there to learn the material. Outside of class time is your time to...
May 25, 2024
FactChecker
reacted to
DennisN's post
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Stargazing
My photo of Jupiter (I think)
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Hi, here's an excellent guide which you may find useful: A Guide to Smartphone Astrophotography (NASA)...
May 24, 2024
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