混-4三角形分解的大集,记为LT4(v,λ,4λ),是一个集族{(X,Br):1≤r≤v-2/λ}.其中,X是一个v元素,每一个(X,Br)是一个混-4三角形分解T4(v,λ,4λ).混-4三角形分解的超大集,记为OLT4(v,1,4),是一个集族}(X\{x},Bx):x∈X}.其中,X是一个v+1元集,每一个(X\{x},dx)是一个混-4三角形分解T4(v,1,4).给出了LT4(v,λ,4λ)和OLT4(v,1,4)存在的充分必要条件.
Large sets of mixed - 4 triangle decomposition, denoted by LT4 ( v, λ, 4λ ), is a collection {(X,Br):1≤r≤v-2/λ} ,where X is a v-set,each (X,Br) is a mixed-4 triangle decomposition T4 (v,λ,4λ) Overlarge sets of mixed -4 triangle decomposition, denoted by OLT4 ( v, 1, 4), is a collection | (X / { x} ,dx ) :x∈X}, where X is a (v + 1 )-set,each (X / {x},dx) is a mixed-4 triangle decomposition. The necessary and sufficient conditions for the existence of LT4 ( v, λ, 4λ) and LT4 ( v, 1,4)is given.