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<?xml version="1.0" encoding="utf-8"?>
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<page xmlns="http://projectmallard.org/1.0/" type="guide" id="boolean">
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<link type="guide" xref="index#equation"/>
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<title>Boolean Algebra</title>
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Boolean algebra can be calculated using the AND, OR and XOR operators.
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Buttons for these symbols are available in <link xref="mouse">programming mode</link>.
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The NOT <link xref="function">function</link> inverts the bits in a number.
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The word size is set from the <guiseq><gui>Calculator</gui><gui>Preferences</gui></guiseq> menu.