论文标题
准标记Poset，晶格，排列，图形，挖掘物，超图，点线几何形状
Quasi-projective posets, lattices, permutations, graphs, digraphs, hypergraphs, point-line geometries
论文作者
论文摘要
结构$ \ cal s $是准标准的，如果对于每个结构$ \ cal t $，则对于每个同构$ f：{\ cal s} \ rightarrow {\ cal t} $ {\ cal t} $和每个表达式$ j：{\ cal s}} j = f $。在本文中，我们表征了任意基础性，有限的置换，图形和图形的晶格和循环，没有循环，没有循环，有限的超图和有限点线几何形状的晶格。
A structure $\cal S$ is quasi-projective if for every structure $\cal T$, for every homomorphism $f : {\cal S} \rightarrow {\cal T}$ and every epimorphism $j: {\cal S}\rightarrow {\cal T}$ there is an endomorphism $ϕ$ of $\cal S$ such that $ϕ\circ j=f$. In this paper, we characterise the quasi-projective posets and lattices of arbitrary cardinalities, finite permutations, graphs and digraphs of arbitrary cardinalities with loops and without loops, finite hypergraphs, and finite point-line geometries.
