30,658 reputation
33194
bio website brilliant.org
location San Francisco, CA
age 30
visits member for 1 year, 11 months
seen 2 hours ago

Calvin Lin is the Math Challenge Master at Brilliant. He was born in Singapore, represented his home country at the International Mathematical Olympiad in 2001 and 2002, and trained the Singapore IMO team in 2005. Calvin studied economics and mathematics at the University of Chicago and graduated with a joint BA-MA in Mathematics in four years. While he was a student at the U of C, he continued training bright young mathematicians as an instructor for the Young Scholars Program for four years.


Nov
22
answered Different solution for MOSP(Mathematical Olympiad Summer Program) 2001 Test 9 Problem
Nov
3
revised Blackboard operation $x,y,z\rightarrow x,y,1/(zx+zy)$
added 322 characters in body
Nov
3
answered Blackboard operation $x,y,z\rightarrow x,y,1/(zx+zy)$
Nov
1
answered Maximum number of squares with same number
Nov
1
comment Maximum number of squares with same number
@Traklon You can improve that arrangement, by also flipping the bottom row (7 boards) and the right most row (7 boards).
Oct
31
comment Maximum number of squares with same number
Must a sub board consist of consecutive rows and columns?
Oct
29
answered Irrationality of Decimal Expansion of Primes
Oct
29
comment GCD of adjacent pairs take on all possible values
@simmons Opps. Typo. Fixed
Oct
29
revised GCD of adjacent pairs take on all possible values
added 31 characters in body
Oct
29
answered GCD of adjacent pairs take on all possible values
Oct
26
comment Game placing numbers in increasing order
Seems pretty straight forward. Let 100 be a variable $n$, and find the winning strategies for Arron on $(m,k,n)$. Induct.
Oct
3
comment Prove that there are infinitely many integer solutions to a diophantine equation
What motivates making the construction in the first line?
Sep
30
awarded  Explainer
Sep
30
comment Minimum sum of set whose average of subsets is positive integer
I believe that the sum should be $ 1/2 n (n-1) p + n$.
Sep
30
answered Minimum sum of set whose average of subsets is positive integer
Sep
30
comment Minimum sum of set whose average of subsets is positive integer
There is a much cleaner way of explaining it, by showing that $ k \mid a_i - a_j$.
Sep
28
comment Looking for mathematics contests
Check out Brilliant, which contains a lot of similar problems to what you are looking for.
Sep
18
reviewed Approve suggested edit on An inequality with a weird condition
Sep
18
comment Number theory problem from 11th Iberoamerican olympiads
Thanks. That was what I got too.
Sep
18
comment Arithmetic progressions of perfect powers
@Fujoyaki Most of the site is free, and there are a lot of similar problems. For certain problems (like this), which we spent significant effort to develop, they are currently placed behind a paywall.