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Steiner triple system
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Mathematics
Area of mathematics
Combinatorics
Extremal set theory
Set family
Uniform set family
2026-09-28
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A
Steiner
triple system
is
a
collection of three-element
subsets
, called blocks, in which every
pair
of points belongs to exactly one block. Distinct blocks consequently meet in at most one point, and
a
system on
v
points has
v
(
v
−
1
)
/6
blocks.
Ancestors
(7)
Uniform set family
Set family
Extremal set theory
Combinatorics
Area of mathematics
Mathematics
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Past exam of the mathematics course of the University of Cambridge
/
2022
/
iii
/
Paper 109
/
4
/
iv
/
Solution
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