Ideal (Partial Order)
An ideal 
of a Partial Order 
is a subset of the elements of which satisfy the property thatif 
and 
, then 
. For 
disjoint chains in which the 
th chain contains 
elements,there are 
ideals. The number of ideals of a 
-element Fence Poset is theFibonacci Number 
.
References
Ruskey, F. ``Information on Ideals of Partially Ordered Sets.'' http://sue.csc.uvic.ca/~cos/inf/pose/Ideals.html. Steiner, G. ``An Algorithm to Generate the Ideals of a Partial Order.'' Operat. Res. Let. 5, 317-320, 1986.
- Zero
- Zero Divisor
- Zero (Root)
- Zero-Sum Game
- Zeta Fuchsian
- Zeta Function
- Zeuthen's Rule
- Zeuthen's Theorem
- Zig Number
- Zigzag Permutation
- Zig-Zag Triangle
- Zillion
- Zipf's Law
- Z-Number
- Zollner's Illusion
- Zonal Harmonic
- Zone
- Zonohedron
- Zonotype
- Zorn's Lemma
- z-Score
- Zsigmondy Theorem
- Z-Transform
- z-Transform
- z-Transform (Population)