Math Stack Exchange

Bounty offered: A step in the completeness proof of first-order logic math.stackexchange.com/q/3887317?atw=1 #logic

Bounty offered: An alternate infinite series for Gaussian function - proof math.stackexchange.com/q/4633395?atw=1 #sequencesandseries

Showing that prime factors of a number is congruent to $1 \pmod 5$ math.stackexchange.com/q/4634737?atw=1 #elementarynumbertheory

Can you answer this? Can I go from the LU factorization of a symmetric matrix to its Cholesky ... math.stackexchange.com/q/1395069?atw=1 #linearalgebra

Bounty offered: Intersections of a ray from star domain to its boundary math.stackexchange.com/q/1735663?atw=1 #generaltopology

Bounty offered: Bounds on $\max_i p_i$ in terms of $\sum_i p_i^2$ math.stackexchange.com/q/4633085?atw=1 #linearalgebra

Bounty offered: Asymptotic stability implies the existence of a strong Lyapuno... math.stackexchange.com/q/4624890?atw=1 #ordinarydifferentialequations

How to distinguish between isomorphic and homotopic chain complexes? math.stackexchange.com/q/4634338?atw=1 #homologycohomology

Find n given that $\lim\limits_{x\rightarrow0} \frac{1-\sqrt{\cos2x}.\sqrt[3]{\cos3x}.\sqrt[4]{\cos4... math.stackexchange.com/q/4634181?atw=1 #limits

Bounty offered: Conjecture about difference of Fibonacci numbers and primes math.stackexchange.com/q/4632595?atw=1 #numbertheory

Great answer: Is there any way to find the number of real roots of a polynomial computationally? math.stackexchange.com/a/4633296?atw=1 #polynomials

Qualifying exam problem (complex analysis) math.stackexchange.com/q/4633981?atw=1 #complexanalysis

number of distinct commutators and the cardinality of the center of a group math.stackexchange.com/q/4633944?atw=1 #abstractalgebra

Bounty offered: Homotopy Types of Fibrations in Postnikov Tower encoded by Classifing map math.stackexchange.com/q/4631673?atw=1 #algebraictopology

Can you answer this? Is $5^x+x$ ever prime? math.stackexchange.com/q/4633143?atw=1 #numbertheory

Bounty offered: Examples of random variables with discrete distribution math.stackexchange.com/q/4632301?atw=1 #probability

Solving for x in logarithmic equation $\log_4(2x) = \frac{1}{2}x^2 - 1$ math.stackexchange.com/q/4633571?atw=1 #algebraprecalculus

Bounty offered: Which number is greater A or B? math.stackexchange.com/q/4627075?atw=1 #inequality

Proving that ${(1-\frac{2}{x^2})}^x < \frac{x-1}{x+1}$ for any $x > 2$. math.stackexchange.com/q/4633390?atw=1 #limits

Can you answer this? Factorize: $a^3(b+c)+b^3(a+c)+c^3(a+b)$. math.stackexchange.com/q/1385499?atw=1 #factoring