{'fraction_non_alphanumeric': 0.01820250284414107, 'fraction_numerical': 0.0, 'mean_word_length': 4.945945945945946, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
GROUP THEORY AND SUPERFLUID SYSTEMS

By its very nature, a meeting of physicists deals with abstractions. Mathematics, perhaps the most abstract language of all, is used to model the concrete physical processes we see in the real world. But not every state of the physical world is satisfactorily modelled this way; in particular, as Edmund Burke pointed out, “Abstract liberty, like other mere abstractions, is not to be found.” The holding of this Third International Conference on Collective Phenomena bears eloquent testimony to the very real and concrete existence of a spirit of scientific liberty that no outside force can quench. I am grateful to my Soviet colleagues for having given me the opportunity to share with them the exhilirating joy of a free scientific exchange of ideas, and to experience at first hand their dedication to this highest expression of liberty.