In Newton’s work on calculus, he thought of the variable x as a ‘flowing quantity’ or fluent. The rate of change of x was called the fluxion of x, denoted by x˙.
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。