User contributions
(newest | oldest) View (newer 50 | older 50) (20 | 50 | 100 | 250 | 500)
- 15:25, 17 September 2012 (diff | hist) . . (+158) . . m 1978 USAMO Problems (→Problem 3)
- 15:25, 17 September 2012 (diff | hist) . . (+537) . . m 1978 USAMO Problems (→Problem 2)
- 15:25, 17 September 2012 (diff | hist) . . (+48) . . m 1978 USAMO Problems (→Problem 1)
- 15:24, 17 September 2012 (diff | hist) . . (+446) . . N 1978 USAMO Problems/Problem 5 (Created page with "== Problem == Nine mathematicians meet at an international conference and discover that among any three of them, at least two speak a common language. If each of the mathematicia...")
- 15:24, 17 September 2012 (diff | hist) . . (-2) . . m 1978 USAMO Problems/Problem 3
- 15:24, 17 September 2012 (diff | hist) . . (+363) . . N 1978 USAMO Problems/Problem 4 (Created page with "== Problem == (a) Prove that if the six dihedral (i.e. angles between pairs of faces) of a given tetrahedron are congruent, then the tetrahedron is regular. (b) Is a tetrahedron...")
- 15:23, 17 September 2012 (diff | hist) . . (+534) . . N 1978 USAMO Problems/Problem 3 (Created page with "== Problem == An integer <math>n</math> will be called ''good'' if we can write <math>n=a_1+a_2+\cdots+a_k</math>, where <math>a_1,a_2, \ldots, a_k</math> are positive integers...")
- 15:22, 17 September 2012 (diff | hist) . . (+978) . . N 1978 USAMO Problems/Problem 2 (Created page with "== Problem == <math>ABCD</math> and <math>A'B'C'D'</math> are square maps of the same region, drawn to different scales and superimposed as shown in the figure. Prove that there ...")
- 15:21, 17 September 2012 (diff | hist) . . (+326) . . N 1978 USAMO Problems/Problem 1 (Created page with "== Problem == Given that <math>a,b,c,d,e</math> are real numbers such that <math>a+b+c+d+e=8</math>, <math>a^2+b^2+c^2+d^2+e^2=16</math>. Determine the maximum value of <math>...")
- 15:20, 17 September 2012 (diff | hist) . . (+17) . . User talk:1=2 (1977 USAMO Complete!)
- 15:19, 17 September 2012 (diff | hist) . . (+1) . . m 1974 USAMO Problems/Problem 1 (→See Also)
- 15:19, 17 September 2012 (diff | hist) . . (+1) . . m 1974 USAMO Problems/Problem 5 (→See Also)
- 15:17, 17 September 2012 (diff | hist) . . (-47) . . m 1977 USAMO Problems/Problem 2 (→Problem)
- 15:16, 17 September 2012 (diff | hist) . . (-7) . . m 1977 USAMO Problems/Problem 5 (→Problem)
- 15:16, 17 September 2012 (diff | hist) . . (-62) . . m 1977 USAMO Problems/Problem 5 (→Problem)
- 15:15, 17 September 2012 (diff | hist) . . (-6) . . m 1977 USAMO Problems/Problem 5 (→Problem)
- 15:15, 17 September 2012 (diff | hist) . . (+636) . . N 1977 USAMO Problems/Problem 5 (Created page with "== Problem == If <math> a,b,c,d,e</math> are positive numbers bounded by <math> p</math> and <math> q</math>, i.e, if they lie in <math> [p,q], 0 < p</math>, prove that <cmath> (...")
- 15:14, 17 September 2012 (diff | hist) . . (+511) . . N 1977 USAMO Problems/Problem 4 (Created page with "== Problem == Prove that if the opposite sides of a skew (non-planar) quadrilateral are congruent, then the line joining the midpoints of the two diagonals is perpendicular to th...")
- 15:14, 17 September 2012 (diff | hist) . . (+1) . . 1977 USAMO Problems/Problem 3 (→See Also)
- 15:13, 17 September 2012 (diff | hist) . . (-2) . . m 1977 USAMO Problems/Problem 3
- 15:13, 17 September 2012 (diff | hist) . . (+358) . . N 1977 USAMO Problems/Problem 3 (Created page with "== Problem == If <math> a</math> and <math> b</math> are two of the roots of <math> x^4\plus{}x^3\minus{}1\equal{}0</math>, prove that <math> ab</math> is a root of <math> x^6\pl...")
- 15:13, 17 September 2012 (diff | hist) . . (+556) . . N 1977 USAMO Problems/Problem 2 (Created page with "== Problem == <math> ABC</math> and <math> A'B'C'</math> are two triangles in the same plane such that the lines <math> AA',BB',CC'</math> are mutually parallel. Let <math> [ABC]...")
- 15:12, 17 September 2012 (diff | hist) . . (+368) . . N 1977 USAMO Problems/Problem 1 (Creation!)
- 15:11, 17 September 2012 (diff | hist) . . (+17) . . User talk:1=2 (1976 USAMO Complete!)
- 15:10, 17 September 2012 (diff | hist) . . (+2) . . m 1976 USAMO Problems/Problem 5 (→Solution 2)
- 15:10, 17 September 2012 (diff | hist) . . (+2) . . m 1976 USAMO Problems/Problem 4 (→Solution)
- 15:10, 17 September 2012 (diff | hist) . . (+2) . . m 1976 USAMO Problems/Problem 3 (→Solution)
- 15:10, 17 September 2012 (diff | hist) . . (+2) . . m 1976 USAMO Problems/Problem 2 (→Solution)
- 15:10, 17 September 2012 (diff | hist) . . (+2) . . m 1976 USAMO Problems/Problem 1 (→Solution)
- 15:10, 17 September 2012 (diff | hist) . . (+28) . . m 1975 USAMO Problems/Problem 5 (→Solutions)
- 15:09, 17 September 2012 (diff | hist) . . (+10) . . m 1975 USAMO Problems/Problem 4 (→Solution)
- 15:09, 17 September 2012 (diff | hist) . . (+27) . . m 1975 USAMO Problems/Problem 3 (→Solution)
- 15:09, 17 September 2012 (diff | hist) . . (+28) . . m 1975 USAMO Problems/Problem 2 (→Solution 3)
- 15:09, 17 September 2012 (diff | hist) . . (+3) . . m 1974 USAMO Problems/Problem 5 (→Solution 3)
- 15:09, 17 September 2012 (diff | hist) . . (+28) . . m 1974 USAMO Problems/Problem 4 (→Solution)
- 15:09, 17 September 2012 (diff | hist) . . (+28) . . m 1974 USAMO Problems/Problem 3 (→Solution)
- 15:08, 17 September 2012 (diff | hist) . . (+3) . . m 1974 USAMO Problems/Problem 2 (→Solution)
- 15:08, 17 September 2012 (diff | hist) . . (+2) . . m 1974 USAMO Problems/Problem 1
- 15:08, 17 September 2012 (diff | hist) . . (+28) . . m 1973 USAMO Problems/Problem 5 (→Solution)
- 15:08, 17 September 2012 (diff | hist) . . (+28) . . m 1973 USAMO Problems/Problem 4 (→Solution)
- 15:08, 17 September 2012 (diff | hist) . . (+28) . . m 1973 USAMO Problems/Problem 3 (→Solution)
- 15:08, 17 September 2012 (diff | hist) . . (+28) . . m 1973 USAMO Problems/Problem 2 (→Solution)
- 15:07, 17 September 2012 (diff | hist) . . (+28) . . m 1973 USAMO Problems/Problem 1 (→Solution)
- 15:07, 17 September 2012 (diff | hist) . . (+27) . . m 1972 USAMO Problems/Problem 3 (→Solution)
- 15:07, 17 September 2012 (diff | hist) . . (+28) . . m 1972 USAMO Problems/Problem 2 (→Solution)
- 15:07, 17 September 2012 (diff | hist) . . (+26) . . m 1972 USAMO Problems/Problem 1 (→Solution)
- 15:07, 17 September 2012 (diff | hist) . . (+26) . . m 1976 USAMO Problems/Problem 1 (→Solution)
- 15:07, 17 September 2012 (diff | hist) . . (+26) . . m 1976 USAMO Problems/Problem 2 (→Solution)
- 15:06, 17 September 2012 (diff | hist) . . (+1) . . m 1976 USAMO Problems/Problem 3 (→Solution)
- 15:06, 17 September 2012 (diff | hist) . . (+26) . . m 1976 USAMO Problems/Problem 4 (→Solution)
(newest | oldest) View (newer 50 | older 50) (20 | 50 | 100 | 250 | 500)