I have encountered two undefined symbols when reading this paper:
Given two real and positive semidefinite matrices $A$ and $B$ with the same size,
- the first relation is written as $$A \npreceq B, $$ which appears on the top of Page $10$.
Does it mean that $(B-A)$ is not positive semidefinite, i.e., the minimal eigenvalue of $(B-A)$ is negative?
- another relation is written as $$ A \succsim B ,$$ which appears on the top of Page 9, in the text after equation (2.8).
Is this symbol somehow related to matrix similarity?
Could you help me find a reference where these symbols are clearly defined?