918252.fig.0019a
(a) The base case with only positive polar nodes being active
918252.fig.0019b
(b) The base case with only negative polar nodes being active
918252.fig.0019c
(c) Induction step for the positive polarity case
Figure 19: Induction proof for that a long variable structure can be unit-disk covered by + 1 nodes with the same polarity.