Introduction Definition and 851 Threads

Hello, I don't have much to say at the moment, I just signed up on a recommendation from HN and thought I'd give it a try. I'm probably mostly here to lurk and read older stuff, but I figured it was worth making an account and introducing myself.

Hello everyone. My name is Przemek. I am from Poland and I am intrested in quantum physics and intermolecular forces.

Hi, hope all are happy souls! cheers!

Hi there, good to meet you all, looking forward to our discussions!

Hi PF! I am a new member and looking forward to learning new things here. Thanks!

Hello! I am Logan, I am a student and i like chemistry! I came here because I was searching for an answer for a reaction I did but found nothing elsewhere.

I'm out here

Hello!

Hello everyone!

Hi, new member here. I'm a fiction writer and could use a bit of help in writing scenes based on real science. It's harder to make something up that clearly defies the laws of physics. Looking forward to dive into the forums. I'll try not to pester you with stupid questions, but please forgive...

Hello everyone! My name is Psyklon and I work as a full-stack developer at my job. In my free time, I mostly generate things on my computer like fractals, cellular automata, and various other generative arts. Since I first read about fractals I was fasciated by them, so I started to dive...

TL;DR Summary: education, history I need to devise a module for next academic year which is an introduction to pure mathematics. They need to use this module as a stepping stone module such as number theory, group theory, combinatorics, real analysis. What should I cover to make this an...

The code with no modifications is at the very bottom. For part 1: loading a mat file into the code, I just put it above the last function but it's going to have to replace the data part of the original code thus I have to extract it out of the file: (I would add the file but I am unsure of how...

Hi! As a kid, I remember wanting to become an astronaut. "Honey, you need to know lots of math for that!", replied my mother. She knew how much of an enthusiastic student I was, especially regarding the things of the world. That was one of the first graves to be dug in my own, VIP "Cemetery of...

TL;DR Summary: Looking for literature on O(N) vector model Hello, We have been going over the O(N) vector model in my QFT class but the notes are not very detailed and we are not using a textbook. Does anyone know of a good QFT book which goes over this material? I have a copy of Shrednicki...

I came across HSB for the first time when I was reading a guide on Java. What is the difference between the two, and how do you convert from RGB to HSB (and vice versa)?

What combination of resources can you recommend for introducing people to spherical harmonics? Assume that the audience has the mathematical maturity of first-year grad students in mathematics, and will want a decent introduction to the theory and constructions. But also assume that this is part...

Which textbook is recommended for a modern introduction to QFT? What mathematical topics do I need to know to start studying QFT? From which textbooks can I learn them? I know calculus, linear algebra, mathematical methods of physics (the necessary topics for quantum mechanics). I learned basic...

Hi, As an Undergraduate student I'm looking for some textbooks and/or articles as an introduction to superconductors. I have a homework to do as final project not exactly in this field but related. and I would like to understand what exactly is a superconductor as well as use those textbooks...

Nice to meet you all! I am a college dropout self-studying math. Before dropping out, I flunked out my Calculus class even though I managed to pass my Precalculus class (I honestly don't know how). I realized that I was lacking a lot in Geometry and Trigonometry. My understanding of algebra is...

Hello everyone! I'm new to this forum, and I've tried looking at all the conventions on the forum, but if anything I say is out of line, please speak up! With that out of the way, I've added some of my background in physics in the spoiler, with the main questions below that. Looking back at...

How did you find PF?: I searched google for a Physics Forum I searches Google for a Physics Forum, to enable me to pose a question to people who know more about physics than I do. I have no detailed physics knowledge, but do read a lot of science articles, so understand most of the basics. A...

Namashkar everyone. This is Annwoy Roy Choudhury from Kolkata, West Bengal, India. I am a first-year student at the Indian Institute of Petroleum and Energy, Visakhapatnam Chemical Engineering under the Indian Institute of Technology, Kharagpur. As everything got delayed here because of the...

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I was trying to further look into the fact as to why photons don't experience time and I came across this amazing forum! Planning to indulge in discussions in my free time. I am a software professional by trade. I have to admit, I'm not good at math. I resented math classes in school and...

Hi there, I am currently reading introduction to Chemistry fourth edition by Bauer, Birk, Marks. what do you guys think about this book? is it a good book? I am doubting the quality of the book because I found one wrong statement about the reaction of Alkaline Earth Metals. It said "Alkaline...

Hi, my daughter saw my MTW copy on the desk and she asked me about the picture with the apple in front. To introduce her to the idea of gravitation as curved spacetime I answered like this: Consider you (A) and a your friend (B) at two different spots on a garden each with a firecracker. Take...

This is username Deep Sciences and joined this forum to share and explore information about the beauty of physics and science.

Hello, In the context of Legendre expansion with ##C_\ell## quantities, below the following formula which is the error on a ##C_\ell## : ##\sigma_(C_{\ell})=\sqrt{\frac{2}{(2 \ell+1)\Delta\ell}}\,C_{\ell}\quad(1)## where ##\Delta\ell## is the width of the multipoles bins used when computing...

Can anyone provide a good introductory reference to machine learning. Right now, I am interested in understanding the advantages and disadvantages of the various ML methods. I am not currently interested in detailed descriptions of their implementation. I am probably going to have to brush up...

Hello! I am a senior in high school who adores physics and hopes to pursue it further in college. I joined this forum because I haven't really found a community that likes physics as much as I do. Hopefully, this is the right place. Right now, I am currently building my knowledge of fluid...

Hello guys, I am a 22 years old french physics student. I am doing a master in Theoretical Physics and want to have a PHD. I love fundamental physics and this is what I want to do for the rest of my life. Because I am an idiot, I never really studied hard or listened during lecture so I have a...

Hi! Does anybody know if, and if so where, to find solutions for the textbook on elementary particle physics by David Griffith? I would like to compare my results to check if I am doing it alright. Thanks gluon

I'm a physicist familiar with QM, QFT and GR etc but I've never really sat down and learned astrophysics properly. Would Steven Weinberg's new book be considered a good advanced introduction or would people recommend another text. Half tempted to get it anyway to complete the Weinberg collection.

Hi! I have been looking at differential forms, manifolds and de Rham cohomology. Now I'm trying to figure out the connection from cohomology and equations of motions and topological field theory. Problem is that I am only looking at abelian field theories and I only find introductions into...

How much does the equivalent width of a line change by the introduction of 5% scattered light? We know the equivalent width is defined as We know the equivalent width is defined as $$W = \int_{-\infty}^{\infty} \bigg(\frac{1-F_{\nu}}{F_c}\bigg) \, d\nu$$ where ##F_{\nu}## represents the flux in...

Hello everyone! I'm glad I found this forum. I'm a student and studying to be a system analyst. Sometimes I need help with physics for homework and sometimes I have questions which interesting for me because I'm interesting in physics. So, I hope I'll find interesting threads for me :) Have a...

I am self-studying Ivan Niven's An Introduction to the Theory of Numbers. Unfortunately, I find myself stuck while doing the problems. With this in mind, I would like to ask whether anyone here has the solution manual for Niven's textbook. Hopefully a softcopy version is available? Thank you in...

Summary:: Good introductory book about Group Theory? Hi, I am looking for a good introductory book about Group Theory for physicists.

I don't really have any support material!

As a person who loves intense discussion and debate, having a decidedly short list of peers willing to engage in such a way over topics like math, science, and etcetera, can be discouraging. By turning to these forums, my ultimate goal is to finally participate in a different sort of...

Can anyone advise me on a good introductory website about (formal) logic? Preferably about logic in a broad sense.

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Greetings fellow forum users! I'm a hungarian physicist specialised in geophysics, currently doing a Master's Degree in Space Research & Remote Sensing. I enjoy participating in science-related discussions, so finding this website was the highlight of my day. I hope you have a nice weekend, and...

Summary:: Linear algebra 1.Let a a fixed vector of the Euclidean space E, a is a fixed real number. Is there a set of all vectors from E for which (x, a) = d the linear subspace E / 2. Let nxn be a matrix A that is not degenerate. Prove that the characteristic polynomials f (λ) of the matrix A...

prove that $2+8{\sqrt{-5}}$ is unit and irreducible or not in $\mathbb Z+\mathbb Z{\sqrt{-5}}$.

prove that u(z+zw)={+1,-1,+w,-w,+w^2,-w^2}