TỈ SỐ KÉP CỦA BỐN ĐƯỜNG THẲNG LOBACHEVSKY ĐỒNG QUY TRONG HÌNH HỌC VỚI MÔ HÌNH NỬA MẶT PHẲNG POINCARÉ

Abstract

In this paper, we establish the relationships between the Cross ratio of four concurrent Lobachevskian lines and the Cross ratio of four points. The main findings of the paper are Theorem 2.1 and Consequence 2.3.

Keywords: Cross ratio, Concurrent lines, Lobachevskian line, Poincaré half - plane model.