What is Math and physics: Definition and 198 Discussions

The Journal of Physics A: Mathematical and Theoretical is a peer-reviewed scientific journal published by IOP Publishing. It is part of the Journal of Physics series and covers theoretical physics focusing on sophisticated mathematical and computational techniques. It was established in 1968 from the division of the earlier title, Proceedings of the Physical Society.
The journal is divided into six sections covering: statistical physics; chaotic and complex systems; mathematical physics; quantum mechanics and quantum information theory; classical and quantum field theory; fluid and plasma theory.
The editor in chief is Martin R Evans (University of Edinburgh).

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  1. tas_dogu

    Quantum Math Textbooks to Read Before Starting QFT

    So, I am a 4th year physics student (undergrad), and I will do my master, then hopefully my PhD on theoretical physics. In my university, we take 1 year QM/Classical Electrodynamics/Classical Mechanics in terms of physics then the second year we pick the classes we want to take, I will take QFT...
  2. Rageuke

    Need to derive a formula for the number of red giants

    My hypothesis: The number of red giants is equal to the number of stars times the given fraction f. The number of stars in a solid angle omega, is given by the density distribution of stars in the Galaxy times the volume of the observed solid angle: #RG = f*n(r)*V where V = (d^3*omega)/3. I...
  3. Z

    I enjoy complex problems in science

    Male in my twenties, enjoying hard problems in engineering, mathematics, and physics.
  4. TomVassos

    I Calculating Statistical Likelihood Knowing Standard Deviations

    Let’s say that we know, with 95% confidence, that something is likely to occur when the Universe is between 1058 and 10549 years old. What is the statistical likelihood that it has already occurred in the first 13.8 billion years of the Universe’s existence? (1.38 X 1010 years) I know the...
  5. cryforhelp104

    Questions about what a question is asking

    In my introductory modern physics class, I was asked to compute the Taylor Series for exp(-ax^2) about the value x = 0 to second order in x. I am unfamiliar with the what "exp" before the function means, despite having approximated functions with Taylor Series before. I think there was some gap...
  6. MantisShrimp

    How much force can a truck seat back cushion absorb during a collision?

    I do not know much about this, please help. My truck seat back cushion is 2" thick. Truck A is ~5,700 lbs from google. 2011 f-150 super cab 6.5ft bed. Truck B is ~5775. 2015 GMC Yukon xl slt. If truck A is stopped and braked and truck B hits truck A going 45-55mph creating a force of...
  7. J

    Calculating the Average speed given two speeds

    $$ v_1= 115km/h $$ $$ v_2= 60km/h $$ solution: $$ \frac {v_1 + v_2}{2} $$
  8. Emi_Garrido

    Recommended books for a physics undergrad

    Hello! I'm new here. I'm on my first year of physics at the UNAM, in Mexico, and I want to now which books and resources would you recommend me to 'survive' in the career, not just in physics, but also in the mathematical formalism for subjects such as geometry, abstract algebra, calculus...
  9. Rhdjfgjgj

    To find work done by a variable force

    Guys, please look at the following question I am aware of how to take a dot product of 2 vectors whose i,j,k components are given. My issue is with both integrals. I feel it should be '-dx ' rather than dx because x is decreasing , same as in '-dy'.and I'm taught that if x is decreasing then...
  10. ergo_ergo

    I'm studying to be a year 7-9 (age 12-15) science and math teacher.

    Some message here
  11. billard

    I Deriving formula for kinetic energy

    Hello! I am new to the differential version of classical physics, and I am trying to work how to derive kinetic energy from some pre-assumed equations: Assume that we know: ##\ddot{z} = 0## and ##m\ddot{\textbf{r}} \cdot \dot{\textbf{r}} = 0##This results in $$\frac{1}{2}m\dot{r}^2 = W =...
  12. P

    What's the Future of Physics?

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  13. Entropix

    What is the Mixed Arrangements term and formula?

    My studies relate with construction engineering and environment improvements and I have a passion about combinatorics and exact sciences. I'm always in touch with the novel things that pop out in science related media. I don't like when people start make politics upon science findings. I'm the...
  14. A

    Other Math Help for Physics Undergrad: Advice Needed

    TL;DR Summary: help with math for physics undergraduate degree - advice needed Hello! I'm studying physics for my undergraduate degree. I have a question, and if anyone can help I'd truly appreciate it. I have problems with the math part. I love physics (concepts, research, findings) but i do...
  15. hdsfhsdf

    A "The Operation Combination Problem"

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  16. themethetion

    Projectile Motion Using Vectors

    TL;DR Summary: Using vector functions how can I find the minimum average velocity (something greater than 11.86m/s) of a ball if the launch angle is unknown and if I have a point that the object must travel through (11.86, 3.47)? In my assignment, I developed a function for a lob shot...
  17. NeedFreedom

    I Gravity machine force calculations assistance needed

    Im prototyping a machine to lower liquid from a height using a chains and sprockets. Essentially liquid will fill at top, be lowered over a distance of 4.8 metres then emptied at bottom. The liquid needs to be lowered at a slow pace due to resistance on the output shaft, I am considering...
  18. V9999

    Open problems and suggestions of great mathematical journals

    Hi! Suppose that someone had solved an old but open problem in the great area of mathematics and physics, for instance, dynamical systtems, algebraic geometry and differential equations. Based on your broad experience, what are the best scientific journals to submit such a discovery? In...
  19. M

    How do I incorporate electric fields into capacitors?

    I know that I’m supposed to use proportional reasoning, but where does electric field even fit in? For whatever equation, I know I’m supposed to see how increasing the voltage by either 2 and 4 volts related to electric field. If electric field is the same as “U”, then wouldn’t it be...
  20. S

    Understanding how time derivative = acceleration

    I'm having a hard time understanding some concepts and would really appreciate some help(not super smart so I need some things basically dumbed down). In my physics lab we're going over Newton's Second Law. There's a statement in the lab papers I don't understand. It states "As you should know...
  21. deme76

    Problem set with 5 proofs involving odd, even, parity, etc.

    help me in my problem set qs
  22. P

    Education articles about Astronomy helping learning Math and Physics

    Is there any specialize articles that talk about how Astronomy can help learning Math and Physics? In particular, how observational astronomy can help in the learning process of Math and Physics.
  23. TGV320

    Studying Should I first study the math or math and physics at the same time?

    Hi everyone, After completing high school, I will enroll this fall at a 3 year technical school in China studying industrial robotics, but I still plan on getting into an undergrad physics program at a later time. (Some colleges can allow a transfer to their undergrad program after technical...
  24. N

    Fourier transform of rectangular pulse

    Here is the question: Here is my answer
  25. B

    I How do I compute the second derivative of a one-dimensional array?

    How do I compute the second derivative of an one dimensional array?
  26. T

    I Need Calculus Book Recommendations please

    Summary:: What calculus books do you recommend? Does Thomas Calculus include all the calculus topics? Hi! I'm a 10th grader and preparing for physics olympiads. I'm planning to learn calculus this summer, i self learned prior required topics before calculus (trigonometry, logarithm etc.) ...
  27. E

    What is PF and Why Should AS Level Students Know About It?

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  28. gutelily

    Studying Struggling to teach myself math and physics

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  29. W

    Studying Physics intrigues me but Math makes more sense. What to study?

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  30. F

    Mainstream math and physics teaching/education journals

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  31. L

    Studying Self-study for math and physics or sticking with school material?

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  32. D

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  33. A

    Programs Should I become a physicist or a mathematician?

    I am a person who likes to think deep and can't keep himself from delving deeper into concepts. Even though math is the subject in which I outshine my counterparts, it is physics that I find more fascinating. Also I feel that physics gives math a sense of direction to work upon. But I am a...
  34. heslaheim

    I Some questions in "Introduction to quantum mechanics"

    A certain field has a singularity at the origin, and the divergence of its curl is zero at any point outside the origin, but surface integral of the curl is not zero in the area of any closed surface containing the origin. So how should the Stokes theorem related to this field be expressed at...
  35. E

    Studying Need some advice -- Studying oscillations before differential equations?

    Hello there, I need some advice here. I am currently studying intro physics together with calculus. I am currently on intro to oscillatory motion and waves (physics-wise) and parametric curves (calc/math-wise). I noticed that in the oscillatory motion section, I need differential equation...
  36. D

    Prerequisite mathematics for intermediate mechanics?

    I will be taking intermediate mechanics next semester, and am a bit concerned about potential gaps in my mathematical knowledge. Long story short, I used to be a physics major, switched to electrical engineering, and then decided to double major after a semester in EE. The issue is that, as a...
  37. T

    I Visualisation in math and physics

    Hello. Do physicists and mathematicians visualise math formulas or specialised math or physics words? Words like metric space, Lindelof space, metrizable space, Gamma function, harmonic function, mathematical limits, series, power series, Laurent series, phase space, symplectic space...
  38. J

    Help with Mathematical Solution to a Single Leg Hanging Basket

  39. A

    Who invented electric potential and why?

    Why was that concept necessary ?, I know there's also a gravitational equivalent of this concept I couldn't find anything on google Thanks Daniel
  40. T

    Studying Wrong views on math and physics

    Hello there. I think i have wrong views on math and physics. Specifically, i understand that physics and math contain results on more fields that most people think, but perhaps from popular science books and opinions of other people a wrong view of what math and physics are about still remains...
  41. S

    What Can You Expect to Learn from Studying Math and Physics in College?

    hi all! I study both math and physics, studying for a bachelor degree at college. I hope it will be useful and fruitful for everyone here!
  42. M

    Need some help with a fictional math equation

    Okay so I recently found out that in official canon, the Galactic Republic of Star Wars was founded 25,000 years before the first original movie. Hyperdrives were presumably invented around 25,000 BBY. By the time of the Phantom Menace which is in the year 32 BBY, Technology has stayed basically...
  43. The applications of eigenvectors and eigenvalues | That thing you heard in Endgame has other uses

    The applications of eigenvectors and eigenvalues | That thing you heard in Endgame has other uses

    Zach Star gives an explanation of Eigenvalues and Eigenvectors, with some applications
    • scottdave
    • Media item
    • applied mathematics eigenvalues eigenvectors math and physics
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    • Category: Linear Algebra
  44. E

    Other Math Textbooks for Physics Students

    Hello there, do you guys have recommendations for math textbooks that i should have? The math is of course related to physics, I mean the maths that a physics student must know.
  45. B

    Math Switching from science PhD to math BS?

    Hello, TL;DR: Could it be practical to leave a PhD in Earth science in order to earn a BS in math (starting at the upper division level) if I'm tired of having a spotty math foundation and want to be able to learn anything? I've been on a slow, wandering path towards a vaguely defined "career...
  46. entropy2008

    Cauchy-Riemann Theorem Example in Physics

    I was thinking of the wavefunction in QM but I'm not sure how it's used and when.
  47. Z

    Physics Security Clearance required when applying for jobs related to math and physics?

    I have a quick query. When I'm applying to jobs related to math and physics (software engineer, data analyst, data scientist, python developer, quantitative analyst, programmer, research analyst, etc), I am seeing a good portion of them requiring a security clearance. Is this something others...
  48. mahonskey

    I Hypothetical Eclipse Calculation

    Hypothetical: Approximately how far from Earth would a star the size of the sun have to be for an object the size of a quantum particle to cause a total eclipse of that star when orbiting the Earth at a distance equal to that of Earth to the center fro the moon?
  49. mahonskey

    B Quantum total eclipse of the sun?

    This might be total nonsense, but the thought popped into my head while I was trying to get to sleep, so I thought I see if I could find any advanced help with the following hypothetical: If light were instantaneous, how far from Earth would the sun have to be to cause a quark orbiting in place...
  50. X

    Studying Need some advice: dive straight into physics, or do math first?

    Hello, So, I'm looking for some advice from people here who have experience studying physics outside of an academic program. Recently, I've started Griffiths E&M. Although it hasn't been long, I've been having an absolute blast: like, heart-fluttering, "helping me with suicidal depression"...
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