Quote Definition and 96 Threads

I can use the "Reply" option when I copy someone's text and it appears. However, when I choose the "Quote" option upon copying, maybe the text gets copied but nothing appears. Can someone tell me how to use the "Quote" option on here? Many thanks.

How do I quote a previous contributor, and comment on the quote. Everyone is doing it. I can reply, but I get the entire contribution as quote. I want to focus on a few select quotes. Where are the instructions on how to do it? Can you reply to more than one contribution in the same reply?

Hi, PF, there goes the quote from Calculus 7th ed. by Robert A. Adams and Christopher Essex: "When adding finitely many numbers, the order in which they are added is unimportant; any order will give the same sum. If all the numbers have a common factor, then that factor can be removed from each...

Hello! I am hoping someone can find me a reference for this anecdote. I have a vague memory of reading this somewhere (about ten years ago) and would love to have a reference (I could have it all wrong). But here goes... Linus Pauling was giving a lecture when a student raised his hand to...

“incidentally, to a good approximation we have another law, which says that the change in distance of a moving point is the velocity times the time interval, Deltas=vdeltat This statement is true only iF the Velocity is not changing during that time interval, and this condition is true only in...

Hi PF A personal translation of a quote from Spanish "Calculus", by Robert A. Adams: It's about advice on Lebniz's notation1=(sec2⁡y)dydx means dxdx=(sec2⁡y)dydx, I'm quite sure. Why (sec2⁡y)dydx=(1+tan2⁡y)dydx? But I'm also quite sure that the right notation for (sec2⁡y)dydx=(1+tan2⁡y)dydx...

Can anybody check my work regarding these three statements, the third, in particular, please? I think I got the first two statements down, but I think that I'd feel safer if I got a second opinion. I think I also have a correct translation of the third statement down, but only because I...

Understand me well. My appeal is to observation- observation that each of you must make for himself" . Charles Sanders Peirce What is your interpretation of this?

Hello, I am trying to find in which book Albert Einstein wrote something. I will appreciate any help. The adage i am trying to find is: Education is not the learning of things , but the education of the mind so that it can think. Thank.you

This seems like the best place to ask this. There is a famous QFT textbook that contains a line like "in field theory one learns humility". Does anybody happen to know what textbook this is?

I was reading Fundamentals of Inket Printing and it said the following: "The surface tension in a liquid causes a force to act in the plane of the free surface perpendicularly to a free edge in that surface." Can someone explain to me what this means? What's the direction of the force? I have...

Hi, I'm new to this forum. How do you quote something someone else on the thread has said?

Homework Statement In describing a wheel's circular motion: "Circular motion arises purely from the resistance of the ground upon which it is applied…this resistance is equal to the force which draws the wheel in the right line" Homework Equations F=m(v^2/r) The Attempt at a Solution Is this...

I vaguely remember reading a quote by Einstein related to a physics matter where he said something like "That would be double counting" (i.e. Don't do it). Does this sound familiar to anyone? What was he talking about? Note that this was not a wimsical quote. He was talking about a serious...

I'm looking to find someone who can give me a quote on cost to make tracks and a motorized camera car that can run along the tracks at a specified speed. I can provide more details about the project if anyone is interested in putting together figures to give me an idea what this would cost, so I...

Dear PF Forum, If someone quotes your post from thread other than your quoted post. Do you get an alert? For example like this

How do I find the primary source of some quote in Wikipedia that is not attributed? I mean how am i supposed to attribute something like that in a paper? paper due basically yesterday, that's why i need help quick.thanks for any help

While quoting a post earlier I came across the following interesting behaviour. I pasted a QUOTE tag into a place where the person I was quoting had used large bold text, and accidentally made the QUOTE tag large bold text. This seems to have cause the behaviour below - there is only one QUOTE...

“Hence it is clear that the space of physics is not, in the last analysis, anything given in nature or independent of human thought. It is a function of our conceptual scheme [mind].” It is true that Einstein said it? What does this means?

Einstein wrote in a letter to Max Born that he feels that QM is not the true Jacob, quote: "Quantum mechanics demands serious attention. But an inner voice tells me that this is not the true Jacob. The theory accomplishes a lot, but it does not bring us closer to the secrets of the Old One. In...

http://www.andyross.net/weinberg.htm In number 4 Steven Weinberg said that Traditional religions generally rely on authority, such as a prophet or a pope or an imam, or a body of sacred writings. Scientists rely on authorities of a very different sort. If I want to understand some fine point...

“Concerning matter, we have been all wrong. What we have called matter is energy, whose vibration has been so lowered as to be perceptible to the senses. There is no matter.” Albert Einstein Einstein really said that? Or It's another fake quote from him in the internet?

Page 260: "No modification of quantum electrodynamics at high frequencies is known which simultaneously makes all result finite, maintains relativistic invariance, and keeps the sum of probabilities over all alternatives equal to unity." Is that still true today?

You can talk about people like Buddha, Jesus, Moses, Confucius, but the thing that convinced me that such people existed were the conversations with Bohr. About his time working with Niels Bohr in Copenhagen. http://www.todayinsci.com/W/Wheeler_John/WheelerJohn-Quotations.htm I find this quote...

Isn't the above two statements contrary? From Feynman's quote, the atoms must be wiggling even at absolute zero. Thus we can expect the generation of electromagnetic radiation even at absolute zero. In contrast, according to wikipedia, generation of electromagnetic radiation is possible...

Hello everyone, During my linear algebra, my professor had said that a true gentleman never picks a coordinate system, or something along those lines. He alluded to the person who said it, but I did not quite grasp who it was. I was wondering if anyone might know who said this. Thank you.

Would it be over the top to put in a relevant quote from my favorite mathematician/scientist at the beginning of my academic statement? (The school only has one statement requirement).

Hi, I am programming a command line program in Java. When I try to use System.out.print to print a single quote character, it outputs æ instead. So I get output like Johnæs height is 1.72 m instead of John's height is 1.72m I tried using escape sequence and i get illegal escape...

Hi there I have just re-watched The Matrix (great movie) and one quote really stuck out to me: "The human body generates more bio-electricity than a 120-volt battery and over 25,000 B.T.U.'s of body heat. We are, as an energy source, easily renewable and completely recyclable, the dead...

The total speed of an object through the dimension of space and the dimension of time equals the speed of light. An object moving through space must subtract from its movement through time for the sum to remain at lightspeed. So an object at the speed of light has all its movement through space...

The quote is from Jake Goldberg's Albert Einstein: the rebel behind relativity: p. 53: "As objects begin to move rapidly through the dimension of space, their movement throught the dimension of time must slow down, because no object can move through space-time faster than the speed of light."...

End of chapter 28. "The great power possessed by the general principle of relativity lies in the comprehensive limitation which is imposed on the laws of nature..."

A long time ago I heard a quote that went along the lines of "if we knew the location and velocity of every particle in the universe we could predict every action and reaction from now until the end of time." I'm thinking this idea may have come from Issac Newton as his third law would seem to...

I am trying to remember a quote I once read by Max Planck. Max Planck, Albert Einstein, and other scientists were at a meeting or convention regarding relativity or some other scientific theory. Planck said something like "As the [some scientific theory] cannot extend the time for this...

I am a Physics Nerd and a filmmaker. I have a short film that takes a look at how strange physics can be especially under certain conditions. Wanted to open up with a quote from a well known Physicist that conveys how mind bending physics can be. Doesn't need to be anything too long. Don't...

For a neuroscience book I am writing, I am looking for the person who first said/wrote the following quote: "We discover things about the universe we can no longer even imagine." THIS MAY NOT BE THE EXACT QUOTE, BUT ONLY HOW I RECALL IT FROM ABOUT TEN YEARS AGO. I think it was from a Russian...

Homework Statement I don't really know where to post this but I chose this section. I need help finding the source of this Feynman Quote "The probability of detecting a photon at any point is the sum of all the probabilities of the photon being detected at that point by any path" Homework...

For those who have tried getting online quotes from PCB vendors (i.e. for design or fabrication), may I know your feedback from doing this? I personally have not tried sending a request for quote on the PCB vendor's website but I am interested though quite hesistant in this process. I...

There are two sides to every issue: one side is right and the other is wrong, but the middle is always evil. -AYN RAND Is she trying to say that being a moderate is bad? What exactly does this quote mean?

Ok, I have two (kinda cheating) "Dear Mr. President, there are too many states nowadays. Please, eliminate three. P.S. I am not a crackpot." -Abe Simpson "Remember the time when he ate my goldfish? And you lied and said I never had goldfish. Then why'd I have the bowl, Bart? Why'd I have...

Hi, I'm writing a Master's thesis on superhydrophobic surfaces aimed at preventing ice accumulation, and I'm looking for an appropriate quote to include in my introduction. Any suggestions?

While gravitational redshift refers to what is seen, gravitational time dilation refers to what is deduced to be "really" happening once observational effects are taken into account. When using special relativity's relativistic Doppler relationships to calculate the change in energy and...

Back when I was in high school I had this chapter on Albert Einstein. I remember reading something to the following effect: Can anyone confirm/deny whether Einstein said anything like this? (I mean is there something like "Collected works of Einstein" as there is for other philosophers?)...

I'm looking for a quote I read a few days ago by a famous quantum physicist, I can't remember which one unfortunately. It went along the lines of attacking "soft" science like sociology, psychology as masquerading as real science when really it's not. Basically hard vs soft science. Does...

I'm not sure if I should post this here, but here goes: I'm trying to determine whether this proposition: is itself uncertain, or it doesn't refer to reality. Here are my thoughts: if we let p := "the laws of mathematics refer to reality" q := "they are certain" Then the...

I was bored last night and look at Wikipedia's article on Feynman when I saw this quote: http://en.wikipedia.org/wiki/Richard_feynman#Challenger_disaster (bottom of top paragraph) Can anyone put this into some context and explain what he was talking about?

Famous quote of 2010, earthquakes caused by women dressing "immodestly". It was even published in the Iranian press. An Iranian cleric blamed earthquakes on women who dress "immodestly" and lead young men "astray". Can it be true? After all, these guys are smart enough to build a nuclear bomb...

I'm not sure where to post this, it doesn't really fit anywhere. Anyway, I remember hearing a quote a while ago and I can't completely remember it or who said it. It said something along the lines of "If an extraterrestrial visited earth, they would see a world obesessed with television and...

In his nobel laureate speech. I thought "small values of energy" <=> "long wavelengths"? And for a body of a low temperature T, the maximum is for long wavelengths, so it can't be that either. What did he maen?

out of "The Origin and Development of the Quantum Theory" given somewhere in the 1920's. If you type the title in google, you can read a html copy As a fun historical sidenote, the following quote seems amusing in hindsight: