Symbol Definition and 366 Threads

Ok first a warning, this may be completely bogus as it was a symbol (or actually a notation) that I didn't recognize in a blackboard full of equations from a stupid "teen" movie. It may have been completely meaningless. I was visiting a friend today and her daughter was playing a DVD of some...

Ok, so I'm really at a loss as to how to do this. I can prove the formula by just using determinants, but I don't really know how to do manipulations with the levi-civita symbol. Here's what I have so far: (\vec{B} \times \vec{C})_{i} = \epsilon_{ijk}(B_{j}C_{k})\vec{e_{i}} And I'm...

hello I am just starting some revition for my exams and havr come across this wave funchion and i don't no how to normerlise it i really need some help with this. it is the wave function symbol (x) = -Ae^(σx^2/x^2) what i need to know is how to intergrate it to find a value for A to see if...

math symbol for "in terms of" If there was a simple trig problem like express cos(x) / tan(x) in terms of sin(x). I can't seem to find the mathematical symbol for doing "in terms of". I'm learning on my own, and don't yet have my calculus book, so I'm just reviewing sample problems, but they...

What does the symbol Î mean in number theory? As in... Prove if r,s Î Z, then 4r + 6s is even... Also, where can I find a website with a comprehensive math symbol index?

My prof writes this symbol that looks (sort of) like this \ni for "such that" I just write the words "such that" in my notes... But what is this symbol? I just choose the latex that looked most like what's on the board... is it the right one?

[SOLVED] Quick question.. What does the i^ and the j^ symbol mean? A particle moves from A to D in the figure while experiencing force http://img249.imageshack.us/img249/4294/renderet0.gif . View Figure How much work does the force do if the particle follows path (a) ABD,(b) ACD, and (c) AD...

Dear All: What's the meaning of a equal sign with a triangle over it please? Thanks in advance

What does it mean when an op amp has only a minus sign in its symbol? Is the positive terminal at ground, or is it at some arbitrary voltage?

Does anyone know the symbol for a vertical subset symbol?? i.e the equivalent of \subseteq but which points up (i also need one which points down)?? Thank for the help

i am doing truth tables in a comp sci course and unsure as to what <--> and --> mean for example p-->q boook says p implies q p<-->q boook says biconditional of two statements truth table sshown is as folllowes p w p-->q p<-->q 0 0 1 1 0 1 1...

e=(1/n+1)^n,as n->00, though I have used this symbol for so many times, but I still can not understand the true meaning of it. Why does it has such strange characteristic---d(e^x)/dx=e^x, and e^x=1+x,as x->0, and why is it able to be used everywhere? who can explan this symbol to me?

The mathematical symbol for real numbers is R, with another vertical line coming down on the left side of the R. What is the mathematical symbol for integers? can anyone draw it?

Homework Statement Prove \sum_{j,k} \epsilon_{ijk} \epsilon_{ljk} = 2\delta_{il} Homework Equations \epsilon_{ijk} \epsilon_{ljk} = \delta_{il}(\delta_{jj}\delta_{kk} - \delta_{jk}\delta_{kj}) + \delta_{ij}(\delta_{jk}\delta_{kl} - \delta_{jl}\delta_{kk}) + \delta_{ik}(\delta_{jl}\delta_{kk} -...

http://www.geocities.com/frooha/grid/img6.png What do the two vertical lines (between the one and the R prime) mean? I am pretty sure we haven't covered it yet. Thanks. BTW it's from here: http://www.geocities.com/frooha/grid/node1.html

what does a big inverted V stand for? it's not "and" because it's used right in front of a literal (atomic formula) not sure if it's a quantifier... This is a paper discussing approach based on deontic logic that I am scanning through, but this sign i cannot figure out how to search online...

What symbol is this?? What does this mean " \vdots " I don't what its called so I couldn't google it...Its to do with Susceptibility and Electric Field.

Okay, so how do you know when to put a delta symbol in front of a variable? For example, U=\frac{3}{2}nRT however, it can also be written as \Delta U=\frac{3}{2}nR\Delta T --Change in Internal energy of a system I'm pretty sure that this isn't the case for many equations such as: \Delta...

What does the symbol "d" mean?? I've seen the symbol "d" many times and in a physics lecture. For example: the professor would write: I = \frac {dq}{dt} instead of: I = \frac {Q}{t} I think I've also seen it in calculus equations such as derivatives and such. I'm only in Pre-calculus so I...

What does the symbol T mean when referring to angles? How does this relate to degrees? I.e. A boy exerts a force of 200 at an angle of 023T.

The IAEA and ISO have introduced a new radiation warning symbol meant to be used on high activity Category 1, 2 and 3 radiation sources (which includes RTGs, irradiators, teletherapy, industrial radiography and well logging sources). From the IAEA press release: Most people will probably...

Of all the evil things that I could be stuck on, its not even bad arithmetic this time around. No, I have been stumped by units. Does anybody know what the si symbol 'sc' stands for? Is that even a symbol?

what does the R in hR10 mean for the pearson symbol?

Correct use of "is proportional to" symbol (alpha) Hello, I am facing a problem that can be solved quite easily using the proportional symbol ( I think ), so I would like to try to use it! Only problem is.. I don't know exactly how to use it correctly... The question is :An astronaut weighs...

What does the folowing symbol mean: ¥ and it sometimes has an equals sign through the bottom

Can somebody please help me with this problem? i Would really appreciate it.:smile: One isotope of a metallic element has mass number 59 and 31 neutrons in the nucleus. The cation derived from the isotope has 26 electrons. Write the symbol for this cation.

What does the arrow in the symbol of the MOSFET indicate? I skipped the lecture when we were told this :smile: and I can't figure out myself. I mean if it were after me, I would have put that arrow to indicate the direction of the electric field, but the arrow actually points the oposite way. So...

Hi guys, I know this may sound so "newbieish", but I really need some clarification. While resaerching over the net I came across a proof on a derivation of the Matrix p-norms. While reading, I stumbled upon this part of the proof: \| Ax \|_1 \leq \sum^n_{i=1} \left| \sum^n_{k=1}...

I have a couple of things I need help on: 1. How do I calculate the standard enthalpy change for a reaction? example: 2SO_2 (g) + O_2(g) \rightarrow 2 SO_3(g) What information do I need to calculate standard enthalpy change? What's the symbol for standard enthalpy change? Thanks...

Is there a circuit diagram symbol for an electromagnet? Am I correct in thinking that it is a line with a coil going round it? I have looked all over the web, and cannot find confirmation of this. Thanks, Iceman123

What is the symbol for a solid state relay? I've been using mechanical relay representations in my documentation and just writting next to it "solid state." I don't like doing this, because it implies that the relay is an inductive load, which it isn't... My thought is that it should...

Im going crazy, i just want to write equations in microsoft word, but none include the damn Error symbol which looks like a rounded E :/ I want to use like E with a small i next to it but i cannot. Any ideas :( I am going nuts :<

Hello all. Happy to have finally found this forum, sorry that it took so long! I'm working through a Vector Algebra tutorial and I am having much difficulty with the concepts of Kronecker deltas and the Levi-Civita symbol. I can't fully grasp either of them intiutively. From what I've been...

I have no idea which forum this question should go in, so feel free to move it, mods. But I am looking at an astronomy paper containing this symbol, so I'll ask here. What is that symbol that is used to mean "section"? For example: "The relative light curves of XN Mus 1991 were derived...

I got some questions on symbols I've seen in formulas and equations. What does the greek letter E mean? I see it with letters underneth it sometimes, what do they do? There's a symbol that's a foward slash, it has letters on each end sometimes and it's most of the time in front of the = sign

In Calculus what's that big symbol that's before a function stand for. I kinda looks like a big long f. And then there's that qoutation mark looking thing. It appears beside the F in a function. It kinda looks like this...F'...what's it mean?

Hmm... I'm writing a paper and trying to figure out how to make an x-vector symbol.. as in: \beq ds^2=d(\overrightarrow{x})^2+dt^2 \eeq Except with a smaller arrow over the x, as would be seen in a real paper.

I was given an equation: P(f)=(sqrt(2/(Pi*N)))*(exp(-(nf^2)/2)) What math exercise is exp referring to? Thanks a lot for any help.

Here's one for the conspiracy theorists:

I was curious about the famous Maxwell's equations, and decided, perhaps foolishly, to learn them myself. I know basic Electricity and Magnetics with Calculus, so I figured it was the next logical step. I understood the integral forms of Maxwell's equations, but I got completely lost when I...

Yo! Anyone know of any free font compatible with Word (or that comes with Word!) that has the goddam electric field symbol in it? Whoever came up with that sign had an irrational hatred of word processors.

have not seen this anywhere I've looked, anyone know?

Has anyone a derivation at hand of the Christoffel symbol by permuting of indices in a free fall system? Roland

For a bonus question my physics teacher asked if anyone knew why we use the letter "Q" in terms of heat. If anyone can explain the origin of why we use Q for the symbol your response would be greatly appreciated. Thanks

I am working on some homework that I already handed in, but I can't get one of the problems. The fourth problem on the HW was to prove the forms of (-1/p), (2/p), (3/p), (-5/p), and (7/p). I did this for -1 and 2 using the quadratic residues and generalizing a form for them. for 3 and 7 i...

I'm having trouble with the following VHDL code: library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.STD_LOGIC_ARITH.ALL; use IEEE.STD_LOGIC_UNSIGNED.ALL; entity circuit is port (a, b, c: in std_logic; f1, f2, f3, f4, f5, f6: out std_logic); end circuit; architecture...

There is a symbol that looks like this http://mathworld.wolfram.com/nimg268.gif The symbol is like a line that is curved on both ends. Thanks in advance!

What's that symbol? Today we've studied in the electrodynamique an affector named dalamperes affector defined as: \nabla^2 - \frac{1}{c^2}\cdot\frac{\partial^2}{\partial t^2} c is the speed of light in vacuum, t is time, \nabla is hameltons affector, HERE IS THE QUESTION: What's the...

I'm trying to put an Angstrom symbol into a microsoft Word document. It's a capital A with a little circle over it. But what is that character called? It's not a greek symbol, I don't think. Does anyone know how to put it in Microsoft Equation Editor, or even what it's called so I can...

does anyone know what the symbol that looks like a tall pi means?