# uncookedfalcon

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Hey all-just a student trying to figure out what's going on. Don't be a stranger :D!

 9 How to prove that $\cos (2\pi/n)$ is algebraic? 6 Proving $f$ is a constant function 6 To check whether $\mathrm{rank}(A)$ = $\mathrm{trace} (A)$ 6 The wedge sum of two circles has fixed point property? 5 When does locally irreducible imply irreducible?

# 3,194 Reputation

 +10 Intersection between a closed set and $y=x$ on $[0,1]$ +35 The set of all fixed points of a continuous function $f:[0,1] \to [0,1]$ , satisfying $f \circ f=f$ , is a non-empty interval ? +10 Taylor Series of Products +15 Confused about short exact sequence involving $\mathcal{O}_{\mathbb{P}^n}$ and $\mathcal{O}_Z$ for $\pi:Z\rightarrow \mathbb{P}^n$ closed embedding

# 4 Questions

 6 two identical point charges can't collide 4 If $f: \mathbb{R}^n \rightarrow \mathbb{R}^m$ has coordinates $f^1 \ldots f^m$, and each $f^i$ is differentiable at $0$… 1 Will $i^*$ pull back injectives to injectives? 1 $A[x,y] \not \simeq A[x^2, xy, y^2]$

# 86 Tags

 37 abstract-algebra × 17 17 modules × 9 23 linear-algebra × 10 15 algebraic-geometry × 10 22 general-topology × 12 12 commutative-algebra × 9 19 real-analysis × 16 12 metric-spaces × 6 18 complex-analysis × 11 11 analysis × 6

# 2 Accounts

 Mathematics 3,194 rep 28 MathOverflow 40 rep 6