Mortensen, C.2017-09-222017-09-222015Modern Greek Studies (Australia and New Zealand), 2015; 15-221039-2831http://hdl.handle.net/2440/107996Modal Logic is the logic of necessity, possibility and impossibility. But twentieth century modal logic faced an epistemological problem: how we know the modal status of propositions. Diodorus Cronus, 3rd century BCE, offered an account of modality which avoids the epistemological problem by grounding modality in tense. His argument is plausible and justly famous, becoming known as The Master Argument of Diodorus. This paper uses a combination of modal and tense logics to identify the exact logic that the Master Argument commits us to.enCopyright in each contribution to this journal belongs to its author. © 2015, Modern Greek Studies Association of Australia and New Zealand All rights reserved. No part of this publication may reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, mechanical or otherwise without the prior permission of the publisher.Journal article0030040728194575Mortensen, C. [0009-0001-3942-2126]