
doi: 10.1007/bf01225866
The authors produce an infinite class of combinatorial objects which they call near biplanes. A near biplane is defined as follows: it is a square 1-design with the property that its \(V\times V\) incidence matrix satisfies (i) the inner product of any two distinct rows is 0, 2 or 4; (ii) for any fixed row the sum of the inner products with the remaining rows is \(2(v-1).\) The main theorem is reduced to the following statement: (a) For \(q=4\), either choice of orbit gives rise to a biplane with parameters \(v=11\), \(k=5\), \(\lambda =2;\) (b) For \(q=8\), there is a unique choice of orbit (from the four possible) which gives rise to a biplane with parameters \(v=37\), \(k=9\), \(\lambda =2;\) (c) For \(q>8\), we never obtain a biplane (for any choice of orbit).
near biplanes, General block designs in finite geometry, Combinatorial aspects of block designs
near biplanes, General block designs in finite geometry, Combinatorial aspects of block designs
| selected citations These citations are derived from selected sources. This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 14 | |
| popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Average | |
| influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Top 10% | |
| impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Top 10% |
