Что

..., which (но не what) establishes the formula

..., which (но не what) completes the proof

..., which (но не what) is impossible

We see (conclude, deduce, find, infer, но не have или obtain) that this matrix is symmetric

But $x=y$, which (но не what) follows from ...

$D$ is equal to zero, which (но не what) yields (gives, implies) $x=y$

..., which (но не what) contradicts the maximality of ...

He expected these data to differ greatly from the information received from this experiment