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[[Image:Abinitioshorter.jpg|left|"abinitio"]]
[[Image:Abinitioshorter.jpg|left|"abinitio"]]
'''Logic''' (from [[Ancient Greek|Classical Greek]] λόγος [[logos]]; meaning word, thought, idea, argument, account, reason, or principle) is the study of the principles and criteria of valid [[inference]] and [[demonstration (proof)|demonstration]].
'''Logic''' (from [[Ancient Greek|Classical Greek]] λόγος [[logos]]; meaning word, thought, idea, argument, account, reason, or principle) is the study of the principles and criteria of valid [[inference]] and [[demonstration (proof)|demonstration]].
