Intereting Posts

Coordinate method for solving first order linear PDE
Ways to evaluate $\int \sec \theta \, \mathrm d \theta$
Is it known if $\pi + e$ is transcendental over the rational numbers?
Learning Combinatorial Species.
Orders, Partial Orders, Strict Partial Orders, Total Orders, Strict Total Orders, and Strict Orders
$SL(n,\mathbb R)$ diffeomorphic to $SO(n) \times \mathbb R^{n(n+1)/2-1}$?
Baire: Show that $f\colon \mathbb{R}\to\mathbb{R}$ is a polynomial in an open bounded set
Why are Hornsat, 3sat and 2sat not equivalent?
Identify infinite sum: $\sum\limits_{n=0}^{+\infty}\frac{x^{4n}}{(4n)!}$
$X=(1 + \tan 1^{\circ})(1 + \tan 2^{\circ})(1 + \tan 3^{\circ})\ldots(1 + \tan {45}^{\circ})$. what is the value of X?
Sum and Product of Infinite Radicals
If $Q$ is an operator on a Hilbert space with $Qe_n=λ_ne_n$ for all $n$, then $Q^{-\frac 12}e_n=\frac 1{\sqrt{λ_n}}e_n$ for all $n$ with $λ_n>0$
How to deduce open mapping theorem from closed graph theorem?
Why is this more-detailed proof more acceptable than its trivial counterpart?
Approximating roots of the truncated Taylor series of $\exp$ by values of the Lambert W function

I was just wondering whether or not it is possible to view $\mathrm{PGL}_2$ as an affine algebraic group.

- An integer $n$, such that $nx = 0$, where $x$ belongs to the quotient group $\Bbb Q/\Bbb Z$
- Can someone tell me what group this is?
- Follow-up to question: Aut(G) for G = Klein 4-group is isomorphic to $S_3$
- Meaninig of a symbol at the Circle Group
- How do I show that every group of order 90 is not simple?
- Categorical description of algebraic structures
- On the Factor group $\Bbb Q/\Bbb Z$
- Let $\phi:G_1\to G_2$ be a group homomorphism. Show $\phi(g^{-1})=(\phi(g))^{-1}$.
- Is every finite group of isometries a subgroup of a finite reflection group?
- Estimates on conjugacy classes of a finite group.

Yes, $PGL(V)$ is a linear (affine) algebra group. For more on this you can see these notes:

https://www.ma.utexas.edu/users/allcock/lag/lag14.pdf

See Theorem 7.1. Remember that $PGL(V)$ is defined as a quotient $GL(V) / \mathbb{G}_m$.

- Do the spaces spanned by the columns of the given matrices coincide?
- Prove that in a sequence of numbers $49 , 4489 , 444889 , 44448889\ldots$
- P(A) given that P(A|B) and P(B) are known
- Can a collection of subsets of $\mathbb{N}$ such that no one set contains another be uncountable?
- A question about connected sets in $\mathbb{R}^2$
- If $(x_n)$ is a Cauchy sequence, then it has a subsequence such that $\|x_{n_k} – x_{n_{k-1}}\| < 1/2^k$
- The integral $\int_0^8 \sqrt{x^4+4x^2}\,dx$
- How can I determine if three 3d vectors are creating a triangle
- Intersection and Union of subspaces
- Algebratically find domain of $y=\ln \frac{3x-1}{x+2}$
- Binomial rings closed under colimits?
- A problem regarding the proof of ${p^nk\choose p^n}\equiv k\mod p$, where $p\nmid k$.
- 2013 Putnam A1 Proof understanding (geometry)
- Mean value theorem for integrals: how does the sign matter?
- Why is the derivative of a circle's area its perimeter (and similarly for spheres)?