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Modal algebra
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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/Interior_algebra/TYhpHoYN">Interior algebra</a></li> <li><a href="/facts/Heyting_algebra/Rrny2LRq">Heyting algebra</a></li></ul> <ul><li>A. Chagrov and M. Zakharyaschev, <i>Modal Logic</i>, Oxford Logic Guides vol. 35, Oxford University Press, 1997. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 0-19-853779-4</li></ul>