Follow along with the video below to see how to install our site as a web app on your home screen.
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The bar above a single variable inverts it. A bar above a equation inverts the output of the regualar equation. Compare an AND and NAND gate or a OR and a NOR gate.
4.1 is a simple NAND gate, on the page above.
That should get you started, if you are still confused look through the link below, then let me know if you need any more help.
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