Politics, and in particular the moral and philosophical underpinnings of governance, was never far from his mind.

Or should you consider another subject that needs maths, rather than investigating the philosophical underpinnings of arithmetic?

He writes that through this training he gained enlightenment and insights that would provide the philosophical underpinnings of his methods.

Globally, there has been significant controversy regarding the philosophical underpinnings of parkour.

Unlike the 1980 adaptation, it discards a significant portion of the plot, some minor characters, and much of the philosophical underpinnings of the book.