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A version of topology's fundamental group is developed for digital images in dimension at most 3 in [7] and [8]. In the latter paper, it is shown that such a digital image X ⊂ $$\mathcal{Z}^k $$ , k ≤ 3, has a continuous analog C(X) ⊂ Rk such that X has digital fundamental group isomorphic to Π1(C(X)). However, the construction of the digital fundamental group in [7] and [8] does not greatly...
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