[Merged by Bors] - feat(topology/metric_space): turn nonempty_ball
into an iff
#8747
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set.univ_pi_empty
;metric.nonempty_ball
into aniff
, mark it with@[simp]
; addmetric.ball_eq_empty
closed_ball
s;metric.ball_pi
andmetric.closed_ball_pi
.