Intereting Posts

Bijection between $$ and $
solving this 2nd order ODE
When is the weighted space $\ell^p(\mathbb{Z},\omega)$ a Banach algebra ($p>1$)?
Integer factorization: What is the meaning of $d^2 – kc = e^2$
Proving that there exists an irrational number in between any given real numbers
Polynomial irreducible – maximal ideal
Example of a function $f$ which is nowhere continuous but $|f|$ should be continuous at all points
What happens to the PDE if resistive force equals $av^2$ instead of $av$?
Uniform convergence of sequence of convex functions
Proof that the epis among posets are the surjections
Square root of a matrix
Asymptotic analysis of the integral $\int_0^1 \exp\{n (t+\log t) + \sqrt{n} wt\}\,dt$
Number of integer solutions of the following equation
Counting Binary Strings (No block decompositions)
How is the Inverse function theorem used to prove that the formulae in this question are the same?

The wikipedia article gives a formula for calculating the order of an orthogonal group over finite filed $O(n,q)$:

I don’t see how I can get such formula. Can one come up with some references?

- XOR is commutative, associative, and its own inverse. Are there any other such functions?
- Condition to be a group.
- Supplement to Herstein's Topics in Algebra
- An application of Mobius Inversion $\sum_{d \mid n} \mu(\frac{n}{d})\nu(d) = 1$
- Showing that $\mathbb{Q}$ contains multiplicative inverses
- $f \in K$ of degree $n$ with Galois group $S_n$, why are there no non-trivial intermediate fields of $K \subset K(a)$ with $a$ a root of $f$?

- Sufficient and necessary conditions for $f,g$ such that $\Bbb F_m/(f) \cong \Bbb F_m/(g)$
- Completion as a functor between topological rings
- About proving that $\operatorname{Aut}(\mathbb {D}_n) \cong \mathbb {Z}_n \rtimes \operatorname{Aut}(\mathbb {Z}_n)$
- Isomorphism between quotient rings over finite fields
- Proof of $+0 = -0$
- Is every regular element of a ring invertible?
- Writing a GCD of two numbers as a linear combination
- Is it possible that the zeroes of a polynomial form an infinite field?
- Primitive polynomials
- Isomorphism of Quaternion group

- Separation theorem on the space of all complex continuous functions
- Use Stokes's Theorem to show $\oint_{C} y ~dx + z ~dy + x ~dz = \sqrt{3} \pi a^2$
- Symplectic group action
- Are Monotone functions Borel Measurable?
- Second Order DE's
- Is it a good approach to heavily depend on visualization to learn math?
- Cauchy-Formula for Repeated Lebesgue-Integration
- History Behind Integral Error Between $\pi$ and $22/7$
- Automorphisms of projective special linear group
- Are commuting elements in the Weyl algebra polynomials in one element?
- Definition of functions
- The Binary Representation in Number Theory?
- Finite projective dimension and vanishing of ext on f.g modules
- Why is polynomial regression considered a kind of linear regression?
- If $n\in\mathbb N$ and $k\in\mathbb Z$, solve $n^3-32n^2+n=k^2$.