This is the 3482nd most frequent Chinese word.
数学
Mathematics.
In this sentence, '数学' is used as the subject, meaning 'mathematics', and refers to the field of study.
我喜欢学习数学，因为它很有趣。
I enjoy studying mathematics because it's interesting.
Here, '数学' is utilized as a general noun to represent the discipline of mathematics.
数学是科学的重要基础之一。
Mathematics is one of the important foundations of science.
In this context, '数学' specifically refers to the subject of mathematics as taught in schools.