13,967 reputation
11936
bio website math.brown.edu/~lubinj
location Minnesota
age 78
visits member for 3 years
seen 4 hours ago

Aged mathematician


4h
answered If $R$ is a local ring, is $R[[x]]$ (the ring of formal power series) also a local ring?
2d
answered Function composition: $f^{653}(56)=?$
2d
answered Question about laurent series
2d
answered Are there mathematical contexts where “finite” implicitly means “nonzero?”
2d
answered Help needed to establish a conformal mapping
Oct
21
answered Can you cancel out a term if equal to zero?
Oct
20
answered Showing that $e^{-2} < \ln 2$
Oct
20
answered Algorithm to find the coefficient of GCD linear combination?
Oct
19
answered How does one find/list equivalence classes?
Oct
18
answered How to find the 4th degree polynomial with given values at $0,1,2,3,4$?
Oct
17
answered line segment intersection strange results
Oct
16
answered Power series in $\mathbb{Q}_5$
Oct
14
answered Modular Arithmetic: using congruence to find remainder
Sep
27
answered Relationship between fibonacci number and modulo.
Sep
25
answered Tate's thesis - continuous map from a local field to circle group
Sep
24
answered Can a number have infinitely many digits before the decimal point?
Sep
16
answered PEMDAS question: $F(x) = 3x^2 - x+2$. Find $[f(a)]^2$
Sep
14
answered Prove that the square root of 3 is irrational
Sep
14
answered Why $\mathbb{Q}_p^{ur} \neq \widehat{\mathbb{Q}_p^{ur}}$?
Sep
10
answered Is it true that group of real numbers under addition isomorphic to group of complex numbers under addition