A proposal for how to initiate communication with aliens, starting from just mathematics, is Hans Freudenthal’s “Lincos: Design of a Language for Cosmic Intercourse, Part 1”. (No part 2 ever appeared.)
A fictional example of receiving a dangerous message from the stars is Piers Anthony’s “Macroscope”.
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Less Wrong (text)
Less Wrong (link)
A proposal for how to initiate communication with aliens, starting from just mathematics, is Hans Freudenthal’s “Lincos: Design of a Language for Cosmic Intercourse, Part 1”. (No part 2 ever appeared.)
A fictional example of receiving a dangerous message from the stars is Piers Anthony’s “Macroscope”.