The half-plane model is identical -LRB- at the limit -RRB- to the MISC@1 disc model at the edge of the disc The PERSON@1 model or hyperboloid model employs a 2-dimensional hyperboloid of revolution -LRB- of two sheets , but using one -RRB- embedded in 3-dimensional PERSON@2 space .

The half-plane model is identical -LRB- at the limit -RRB- to the MISC@1 disc model at the edge of the disc This model has direct application to special relativity , as PERSON@2 3-space is a model for spacetime , suppressing one spatial dimension .
