7H.I: Indirect Truth Tables to Determine Validity (1)

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  1. Nathan Sasser
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I just noticed that on the whiteboard, I wrote "Valid: Premises are true, and Conclusion is False." That's a mistake: I meant to write that an argument is INVALID when the premises are true but the conclusion is false. It's not easy to write and talk at the same time :)

nathansasser
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That spelling mistake of "valid" instead of "invalid" threw me for a loop at first, until I read your comment and my uneasiness quelled. You did a much better job at showing why this is useful and how to use this technique step-by-step than my accompanying book was showing. Just to double check, I fully expanded a truth table with 16 rows and filled it out for each premise and conclusion, and unsurprisingly it showed the same exact result as you derived in a fraction of the time, stunning. Thank you for the help, it was very enlightening. :D

jamesmann
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youre saving me for my logic final much love

MrTubby
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i have a test tmr on truth tables thank you for this video 🎉

danny_dorito