Visible Point Vector Partition Identities for Hyperpyramid Lattices

We set out an elementary approach to derive Visible Point Identities summed on lattice points of inverted triangle (2D), pyramid (3D), hyperpyramid (4D, 5D and so on) utilizing the greatest common divisor for the nD Visible Point Vectors. This enables study of partitions in nD space into vector parts distributed along straight lines radial from the origin in first hyperquadrant where coordinates of lattice points are all positive integers. We also give several new combinatorial identities for Visible Point Vector partitions.