A type of unified-field theory in which projective geometry is used. This type of unified field theory has not been successful. It can be regarded as equivalent to Kaluza–Klein theory.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。