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Oct 16, 2011 at 19:38 comment added Standa Zivny Thank you Colin! While looking for an answer, I've discovered the same trick you call "3-stretch", also known as 2-subdivision. From what I've found, it probably first appeared in this paper: Svatopluk Poljak: A note on stable sets and colouring of graphs, Comment. Math. Univ. Carolinae 15 (1974) 307-309 (available here: dml.cz/handle/10338.dmlcz/105554)
Oct 16, 2011 at 19:30 vote accept Standa Zivny
Oct 16, 2011 at 17:10 history answered Colin McQuillan CC BY-SA 3.0