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Search results for “positive characteristic”

64 results

An example of a non-reduced Picard scheme

2026TheorySean Cotner

An example, due to Serre, of a smooth projective surface in positive characteristic whose Picard scheme fails to be reduced, worked out via the two governing dimension inequalities.
1
170

A curiosity: “supersmooth” varieties

2026TheorySean Cotner

A rigidity condition on schemes, strictly stronger than smoothness, introduced with examples and a look at where it fails to be geometric — no known application, just a curiosity.
1
120

IMO 1964

2026Problem sheet

International mathematics competition for pre-university students, held annually since 1959. Six problems over two days.
0
380

IMO 1986

2026Problem sheet

International mathematics competition for pre-university students, held annually since 1959. Six problems over two days.
0
260

IMO 1994

2026Problem sheet

International mathematics competition for pre-university students, held annually since 1959. Six problems over two days.
0
410

IMO 1996

2026Problem sheet

International mathematics competition for pre-university students, held annually since 1959. Six problems over two days.
0
270

IMO 2002

2026Problem sheet

International mathematics competition for pre-university students, held annually since 1959. Six problems over two days.
0
280

IMO 1982

2026Problem sheet

International mathematics competition for pre-university students, held annually since 1959. Six problems over two days.
0
240

IMO 1983

2026Problem sheet

International mathematics competition for pre-university students, held annually since 1959. Six problems over two days.
0
280

IMO 1961

2026Problem sheet

International mathematics competition for pre-university students, held annually since 1959. Six problems over two days.
0
240

IMO 1984

2026Problem sheet

International mathematics competition for pre-university students, held annually since 1959. Six problems over two days.
0
150

IMO 1997

2026Problem sheet

International mathematics competition for pre-university students, held annually since 1959. Six problems over two days.
0
200

IMO 2009

2026Problem sheet

50th International Mathematical Olympiad. Bremen, Germany, 2009.
0
340

IMO 2013

2026Problem sheet

54th International Mathematical Olympiad. Colombia, 2013.
0
350

IMO 2014

2026Problem sheet

55th International Mathematical Olympiad. Cape Town, South Africa, 2014.
0
330

IMO 2024

2026Problem sheet

65th International Mathematical Olympiad, 2024.
0
560

IMO 1965

2026Problem sheet

International mathematics competition for pre-university students, held annually since 1959. Six problems over two days.
0
320

IMO 1975

2026Problem sheet

International mathematics competition for pre-university students, held annually since 1959. Six problems over two days.
0
220

IMO 1976

2026Problem sheet

International mathematics competition for pre-university students, held annually since 1959. Six problems over two days.
0
260