For the other direction, take ......
The “if” direction is trivial.
We pause to record a generalization of Theorem 2 in a different direction.
Proceeding further in this direction, we obtain the following corollary.
Let $A$ denote the rectangle $B$ rotated through $\pi/6$ in a clockwise direction about the vertex $(0,1)$.
The method of proof of Theorem B can be adapted to extend the right-to-left direction of Mostowski's result by showing that ......
the derivative of $f$ at $x$ in $\langle$the$\rangle$ direction $v$
a direction pointing downward with respect to $\tau$
inequality in the opposite direction
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