Visualization for computer algebra
"Properties of the instantaneous Ergo Surface of a Kerr Black Hole" by Nicos Pelavas, Nicholas Neary and Kayll Lake (Class.Quant.Grav. 18 1319 Also at gr-qc/0012052 ) "Invariants of the Kerr Vacuum" by Kayll Lake (At gr-qc/0302087 ) "Differential Invariants of the Kerr Vacuum" by Kayll Lake (At gr-qc/0308038 )