Talk:Young's inequality for products

add the vector version ? $$a^T b \leq a^T a/2 + b^T b/2,\ a, b\in R^n$$ it is useful in control theory when dealing with lyapunov control functions

Add refined versions?
Young's inequality can be tightened, see for example

http://files.ele-math.com/articles/jmi-05-47.pdf.

It is mostly useful for the case n = 2, but this is of course an important case. 70.95.166.6 (talk) 03:52, 1 February 2023 (UTC)