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Logarithm and Uniqueness
September 25th, 2020
real-analysis
Dot product of any point on plane and its normal
August 13th, 2020
vector-spaces
3d
Does potential difference or electric field change with distance between parallel plates?
June 1st, 2022
electricity
Prove that there are infinitely many natural numbers that can't be written as $a^2+p$
June 1st, 2022
elementary-number-theory
The rate of convergence for polynomial interpolation of different functions
June 19th, 2022
numerical-methods
interpolation
chebyshev-polynomials
Does a negative number really exist?
June 25th, 2022
soft-question
philosophy
Does the stretching of a spring depend on its rest length?
June 25th, 2022
homework-and-exercises
spring
Simplifying a Product of Summations
June 1st, 2022
summation
products
Entering a black hole, jumping into another universe---with questions
October 8th, 2020
general-relativity
black-holes
universe
wormholes
white-holes
Bad postdoctoral advisor, help needed
May 23rd, 2020
postdocs
What is the most common photon wavelength in our observable universe (not including the Sun)?
June 16th, 2022
visible-light
photons
frequency
wavelength
observable-universe
Why are closed balls in the $p$-adic topology compact?
August 19th, 2020
general-topology
analysis
p-adic-number-theory
Condition number of a diagonal matrix
December 15th, 2020
linear-algebra
matrices
normed-spaces
condition-number
How to control the dimensions of \colorbox
June 15th, 2022
colorbox
Prove that $\mathbb{N}$ has no limit points
March 6th, 2020
calculus
proof-writing
proof-explanation
Does string theory have a notion of vacuum?
June 1st, 2022
string-theory
vacuum
Raoult's Law explained with thermodynamics/ free energy
June 26th, 2022
gas-laws
entropy
Why two vectors cannot span ${\bf R}^3$?
June 1st, 2022
linear-algebra
vector-spaces
Should I send follow-up email one week after post-doc interview if interviewer said they will make decision in "week or two"?
June 10th, 2022
postdocs
interview
Mathematical writing: why should we not use the phrase "we have that"?
June 23rd, 2022
soft-question
article-writing
Quantization of kinetic and potential energy of electron in H atom
June 15th, 2022
quantum-mechanics
hydrogen
quantization
Order of elements modulo p
June 1st, 2022
number-theory
elementary-number-theory
Largest PhD programs in mathematics
March 9th, 2020
graduate-school
mathematics
Polynomial Long Division
October 18th, 2020
integration
When is infinite sum bounded by an integral?
June 1st, 2022
inequality
integration
summation
If every subset in a topological space is closed, prove it is a discrete space
June 1st, 2022
general-topology
How long did the Pevensies rule in Narnia?
June 26th, 2022
c-s-lewis
the-chronicles-of-narnia
Must an infinite intersection of infinite sets be infinite?
June 1st, 2022
elementary-set-theory
infinity
Why do green lasers appear brighter and stronger than red and blue lasers?
June 16th, 2022
optics
visible-light
laser
vision
Monotonicity in alternating Series
June 1st, 2022
sequences-and-series
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How to find the formula of this alkane?
How can mass affect spacetime?
Change parabolic equation to canonical form
How many numbers lying between 10 and 100 can be formed with the help of digits 1,3,5,7,9?
Count the the number of elements in a set, exactly divisible by 2 out of 3 numbers
Confusion matrix, false negative
SN1 like reaction acid-cataylzed hydrolysis of epoxide
How do the Einstein's differential equation of the curvature of spacetime come out of Einstein's field equation?
Noetherian prime ideals and Noetherian ring
What is the formula for max kinetic and max potential energy of a spring?
Graphs, line graph and complement of graph
Why infinite sums of positive real constants definitely yield infinite?
Finding Radius of Convergence for Power Series
Negative sign of acceleration
Find if possible an orthogonal unit vector at: 2i + 3j - k and - 2i - 3j + 4k
How to calculate MEAN of exponential distribution?
Calculate acceleration and time given initial speed, final speed, and travelling distance?
Prove that every problem in P is reducible
How can a masters student arrange to do a thesis in collaboration with industry?
How many ways an examiner can assign 15 marks to 5 questions?
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