Hardware Freedom Day is April 20th!

Hardware Freedom Day is a yearly celebration of Open Hardware! Every year since 2004 hundreds of teams have been celebrating Software Freedom Day, often showcasing Open Hardware in the process. At the Digital Freedom Foundation(formerly known as SFI) we thought it was about time to have a special day just for Open Hardware. So get your hackerspace in order, your team up to speed and register your event right now!

You can find if there is an event planned near you:

http://www.hfday.org/map/

or learn how to organize one if not:

http://wiki.hfday.org/StartGuide

Anyone planning to go to one or organize one?

cheers,

drew

Top Replies

johnbeetem over 12 years ago in reply to Former Member

Assuming that the site http://www.digilogwiki.com/index.php?title=Minterms_and_Maxterms is intended to be tutorial, it's very important to avoid verbiage that might be contradictory. For that matter, one could interpret:
If El Paso is open, then Phoenix and San Diego must both be either open or closed.
to mean that Phoenix must be either open or closed, and San Diego must likewise be either open or closed. Since there's no "partially open" in Boolean algebra, then Phoenix is always either open or closed, and San Diego is always either open or closed, so they both simplify to TRUE, so the whole given simplifies to "if El Paso is open, then TRUE". Not amusing enough to be a sillygism, so it's just confusing.

They also neglect to say whether 0 means open and 1 means closed, or vice-versa. You need to know this to construct the truth table.

It's hard enough to learn logic without trying to make sense of ambiguous examples. In particular, the premises have got to be clear and unambiguous.
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Former Member over 12 years ago in reply to johnbeetem

agreed, the example is anything but clear and unambiguous!
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billabott over 12 years ago in reply to Former Member

Working backwards from the truth table, I have concluded the the Givens need to be changed from
If El Paso is open, then Phoenix and San Diego must both be either open or closed. If Phoenix is open, then both El Paso and San Diego must be closed.
to
If El Paso is open, then Phoenix and San Diego must both be either open or closed. If Phoenix is open, then both El Paso and San Diego must both be either open or closed.

Happy Trails
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Former Member over 12 years ago in reply to billabott

Bill,
I think you're on to something. Your change would make the last row of the truth table make sense.
But the first row still wouldn't make much sense.
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