Acknowledgment of Problem Sources xv
and other competitions were taken from the journal Crux Mathematicorum.
I am grateful to these sources and to organizers of the contests for allowing
the use of these problems.
University of Toronto examinations (1859-1865):
3.7.1 (t, u); 4.8.23, 30, 31, 32; 8.21, 47, 56
Cambridge ‘IYipos (1870s): 1.7.17; 2.5.5; 3.7.9; 3.8.15; 4.8.15, 16
Elemente der Mathematik: 3.8.2; 4.8.28; 5.4.21, 26; 7.4.
Normat: 8.30, 8.39, 8.
Olympiads: International 4.8.25; 8.
Austrian 1.8.12; 6.4.
Leningrad 2.5.
Moscow 3.7.1(h)
Australian 6.4.
Hungarian 7.5.
Bulgarian 7.5.9; 8.
Other competitions: Albertan (Canada) 3.7.
Greek High School (1984) 4.7.
Austrian-Polish 4.8.
Bulgarian 4.8.
Romanian 8.16; 8.