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The distribution of colias in the equatorial andes
(Caldasia, 1945)
The Genus Colias of primarily yellow and orange Pierid butterflies, is largerly northern in distribution. Representatives are found from Europe across the great Eurasiatic land mass to Siberia and northern Japan from where ...
On the classification of 3--bridge links
(Universidad Nacuional de Colombia; Sociedad Colombiana de matemáticas, 2012)
Using a new way to represent links, that we call a butterfly representation, we assign to each 3-bridge link diagram a sequence of six integers, collected as a triple (p/n,q/m,s/l), such that p≥ q≥ s≥2, 0 and lt;n≤ p, 0 ...