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9 ARML Location
deduck 42
N
Yesterday at 5:40 PM
by llddmmtt1
UNR -> Nevada
St Anselm -> New Hampshire
PSU -> Pennsylvania
WCU -> North Carolina
Put your USERNAME in the list ONLY IF YOU WANT TO!!!! !!!!!
I'm going to UNR if anyone wants to meetup!!! :D
Current List:
Iowa
UNR
PSU
St Anselm
WCU
St Anselm -> New Hampshire
PSU -> Pennsylvania
WCU -> North Carolina
Put your USERNAME in the list ONLY IF YOU WANT TO!!!! !!!!!
last time i made this poll it got deleted by aops admins cuz they were malding about putting usernames in text boxes and saying the username is their real name or somthing but obviously your username is not ur real name bruh whats wrong with those people
I'm going to UNR if anyone wants to meetup!!! :D
Current List:
Iowa
zhoujef000
Arcticturn
Soupboy0
wc31415
vincentwant
bachkieu
Arcticturn
Soupboy0
wc31415
vincentwant
bachkieu
UNR
deduck
KevinYang2.71
dragoon
torch
EaZ_Shadow
MathCosine
rhydon516
MathPerson12321
CrunchyCucumber
KevinYang2.71
dragoon
torch
EaZ_Shadow
MathCosine
rhydon516
MathPerson12321
CrunchyCucumber
PSU
bjump
arush krisp
ethan2011
Pengu14
RedFireTruck
Andyluo
ConfidentKoala4
orangebear
arush krisp
ethan2011
Pengu14
RedFireTruck
Andyluo
ConfidentKoala4
orangebear
St Anselm
DearPrince
maxamc
lpieleanu
maxamc
lpieleanu
WCU
MathRook7817
42 replies
An FE. Who woulda thunk it?
nikenissan 117
N
Yesterday at 5:21 PM
by EpicBird08
Source: 2021 USAJMO Problem 1
Let
denote the set of positive integers. Find all functions
such that for positive integers
and




![\[f(a^2 + b^2) = f(a)f(b) \text{ and } f(a^2) = f(a)^2.\]](http://latex.artofproblemsolving.com/c/1/f/c1f8ffe04cfcc45b498f3931a4796d5c56dc04d0.png)
117 replies


9 Will I make JMO?
EaZ_Shadow 18
N
Yesterday at 3:49 PM
by mathkidAP
will I be able to make it... will the cutoffs will be pre-2024
18 replies

Past USAMO Medals
sdpandit 1
N
Yesterday at 12:27 PM
by CatCatHead
Does anyone know where to find lists of USAMO medalists from past years? I can find the 2025 list on their website, but they don't seem to keep lists from previous years and I can't find it anywhere else. Thanks!
1 reply

usamOOK geometry
KevinYang2.71 106
N
Friday at 11:54 PM
by jasperE3
Source: USAMO 2025/4, USAJMO 2025/5
Let
be the orthocenter of acute triangle
, let
be the foot of the altitude from
to
, and let
be the reflection of
across
. Suppose that the circumcircle of triangle
intersects line
at two distinct points
and
. Prove that
is the midpoint of
.














106 replies
Geo #3 EQuals FReak out
Th3Numb3rThr33 106
N
Friday at 10:56 PM
by BS2012
Source: 2018 USAJMO #3
Let
be a quadrilateral inscribed in circle
with
. Let
and
be the reflections of
over lines
and
, respectively, and let
be the intersection of lines
and
. Suppose that the circumcircle of
meets
at
and
, and the circumcircle of
meets
at
and
. Show that
.




















106 replies
Aime ll 2022 problem 5
Rook567 4
N
Friday at 9:02 PM
by Rook567
I don’t understand the solution. I got 220 as answer. Why does it insist, for example two primes must add to the third, when you can take 2,19,19 or 2,7,11 which for drawing purposes is equivalent to 1,1,2 and 2,7,9?
4 replies
USAJMO problem 2: Side lengths of an acute triangle
BOGTRO 59
N
Friday at 4:41 PM
by ostriches88
Source: Also USAMO problem 1
Find all integers
such that among any
positive real numbers
with
, there exist three that are the side lengths of an acute triangle.




59 replies
high tech FE as J1?!
imagien_bad 60
N
Friday at 3:03 PM
by SimplisticFormulas
Source: USAJMO 2025/1
Let
be the set of integers, and let
be a function. Prove that there are infinitely many integers
such that the function
defined by
is not bijective.
Note: A function
is bijective if for every integer
, there exists exactly one integer
such that
.





Note: A function




60 replies
