 | ECS #776: A simple grammar |
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1. Description
PowerSet of pairs of Sequences
2. Specification
This unlabelled structure is specified as S in
\displaystyle
\left\{ B={\rm Sequence} \left( Z,1\leq {\rm card} \right) ,C={\rm
Prod} \left( B,B \right) ,S={\rm PowerSet} \left( C \right) \right\}
other formats
3. Coefficients
3.1. First terms
4. Ordinary generating function
\displaystyle
{{\rm e}^{\sum _{j_{{1}}=1}^{\infty }-{\frac { \left( -1 \right) ^{j_{{
1}}} \left( {x}^{j_{{1}}} \right) ^{2}}{ \left( -1+{x}^{j_{{1}}}
\right) ^{2}j_{{1}}}}}}
other formats
5. References
6. Random structure
Search a combinatorial structure by: (firstTerms should be a sequence of integers, separated by commas).