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. 2020 Oct 1;415:132753. doi: 10.1016/j.physd.2020.132753

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© 2020 The Author

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 1 — Fraction of extra infected, next to the 12.2%, vs. days of remote teaching, for several opening strategies. The potentially perfect, and hence optimal ones for some values of $τ$ , are close to the continuous curve. One special possibly perfect and hence optimal solution corresponds to the red dot.