Terminology Definition and 179 Threads

Homework Statement Given a field F, FS4 is a group algebra... we have a representation X that maps FS4 to 3x3 matrices over (presumably) F. Let V denote the FS4 module corresponding to X... do stuff. My question is, what the heck is V supposed to be? I assumed that V is F3, but that...

Hi everyone, When people present their data in plots, they always talk about 1-sigma errors, which I totally don't understand. Don't we use the standard deviation to tell us how far the a data point is from the "mean"? Why would I care about the mean when discussing errors? Shouldn't one care...

Hello. First, I'd like to make it clear, I am an IGCSE student who has just finished his board examinations, and is now getting ready to do is AS/A2 levels before pursuing engineering. I'm trying to do some studying on my own, outside for school, particularly in the fields of Maths and...

Homework Statement I'm trying to find out how people in the USA would refer to the following operations - i.e. what name would you give the process of doing something like this: a(a + b) = a^2 + ab (a + b)^2 = (a + b)(a + b) = a^2 + 2ab + b^2 Homework Equations N/A. The Attempt at a...

Some papers refer to Omega_0 without defining it. (Example: The first footnote on page 2 in http://arxiv.org/PS_cache/astro-ph/pdf/9908/9908159v3.pdf.) What's the normal assumption in this case? Omega_0 = Omega_m (Omega_m as in Omega_m + Omega_Lambda = 1 in LambdaCDM) fits the context, but seems...

Dear Forum, I am trying to learn more about the electroproduction of rho meson off proton. e + p -> e + p + rho One of the commonly used kinematic variable is tprime, defined as t-tmin. The definition I could find for tmin is that it is the minimal value of t kinematically necessary...

It's just the terminology but I am just unsure what it means I have 2 functions f(x) = ln(2x-1) g(x) = \frac{2}{x-3} the question is find the exact value of fg(4) now what exactly does that mean. I'm guessing we sub x = 4 into it at some point. It is asking for me to mulitply f(x) by g(x) im...

I'm doing some research on the history of particle physics from 1947-1964, and have been completely unable to find an answer to this question -- does anyone know when and by whom terms such as baryon number and hypercharge were introduced? A related question...Several of my sources cite a...

"T(1,2)=(3,4) T(T(1,2))=T(3,4)=(3,4) (1,2) and (3,4) are linearly independant and form a basis of R2, so (3,4) spans ImT. Therefore dim(imT)=1, and obviously dim(kerT)=1, so the transformation is singular." this is a solution to some problem i can't understand what is "spans an image" i...

I find in the literature the following equation in which the OX(O'X') components of the same tardyon are present (u(x) and u'(x)) in I and in I' respectively. 1=[1-V^2/c^2)]/[(1-V/u(x))(1+V/u'(x)] How would you call it, relativistic identity, reference frame independent...? Thanks in advance.

Please tell me what is the name of a length which is not a proper one and of a time interval which is not a proper one. Thanks

So I am supposed to show that the Infinite series \sum^{\infty}_{k=1}\frac{3}{k+4} does not converge using any method. Now, my question: Is \frac{3}{k+4} the General term? I will wait for a response before I continue, for it may eliminate another question regarding the General Term and Closed...

Hi all. This is going to sound a bit odd, but I'm actually coming over from a piano forum of all places XP Me and a couple of friends are trying to solve some analogies off a very high-ceiling IQ test (the Titan Test) for fun and a question has arisen that none of us will ever be able to...

Data gathered at a particular blood center show that 0.1% of all donors test positive for human immunodeficiency virus (HIV), 1% test positive for herpes, and 1.05% test positive for HIV or herpes. Does the part in bold mean the union of HIV and herpes?

Hi, I'm just trying to get a feel for a subject that I plan to take but I'm unsure about the meaning of a certain term which frequently arises. The term 'flow' comes up a lot and I'm wondering what it could mean (or refers to) in the context of a pipe flow problem. I know my question is vague...

Hi, often I hear people say that there are "X states per unit volume" or something along these lines. What is meant by unit volume? Is this one cubic meter, a cubic centimeter, or what? This is a general question about the terminology that people use anytime they say "per unit"...

Why the mathematician call identification topology "quotient topology"?from my viewpoint,identification topology bear an analogy with difference(minus),not quotient(divide)...BTW,Could anybody tell me the reason why the mathematicians who coined the term "ring","ideal","soul" called them like...

if for non-proper time interval we can use coordinate time interval what could we use instead of non-proper length. thanks for the help?

I am a little confused about some terminology when we talk about curves and regions (in the context of vectors for example). Are these correct? Curve Terminology: Smooth: A curve C is said to be smooth if it is infinitely differentiable everywhere in its domain. Continuous: A curve C is...

Hey friends, When using phrases such as time-like and space-like, is it proper form to use the phrase light-like? Or is there a more professional expression?

I wass wondering what people here think about the use of terminology when it can have multiple meanings. E.g. "mass" can mean either relativistic mass or rest mass, "momentum" can mean linear mechanical momentum or it can mean canonical momentum. Some people prefer to hold that the Lagrangian...

If someone wants an angle that is relative to north with east of north positive and west of north negative, what does that mean? Is that the positive x axis? My guess is the positive y axis, since 90 degrees would have those conditions, but not sure.. Here is the problem that's brought up...

I am a non-native English speaker, but i have to write my homework in English due to IB programme. Anyway the question is - what is the correct term for torpidity coefficient (direct translation from Latvian). It is the force required to stretch smth (a wire, a spring or smth similar) to extend...

If you have a rotary potentiometer that measures the amount of angular displacement, what would you say the output signal of the transducer is? I'm unsure if it's resistance or voltage. A change in angular displacement changes the point of contact within the potentiometer, which directly...

Im getting questions wrong because of the way the questions are written. How do you draw the vectors when the question says 30 degrees west of north? Like the picture attached? Btw don't mind the filename I named it incorrectly.

English's not the native language in my country; however (strangely), currently I'm learning Math in the language. And now I'm encountered with a kind of "language" problem here: I can't see the difference between the defination " term" and " monomials". Do they mean the same thing, but only...

When reading advanced physics articles, I frequently find terminology that is inconsistent with basic physics definitions. For example: "pure energy". I have no idea what that expression means. I have read much about space-time, the arrow or time, etc, but no definition of "time". Where...

Well Another God, it looks like you are going to get your wish! What is a nucleosome positioning element?

Sadly enough, I have never seen a delta symbol in front of a printed genotype. Does this mean anymore than the obvious (obvious being some given changed, unstated, to the genotype)?