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Example of a relation that is not a function. The same element (3) of the domain X relates to both c and d from the codomain Y.
[edit] SVG code
<?xml version="1.0" standalone="no"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg width="400" height="300" version="1.1" xmlns="http://www.w3.org/2000/svg"> <desc>Isso não é uma função (exemplo 1).</desc> <defs> <marker id="seta" viewBox="0 0 10 10" orient="auto" refX="0" refY="3" markerUnits="strokeWidth" markerWidth="7" markerHeight="4"> <path d="M 0 0 L 10 3 L 0 6 z" />> </marker> </defs> <g style="fill:#f0ffd0;stroke-width:2px;stroke:black"> <ellipse cx="100" cy="150" rx="70" ry="100" /> <ellipse cx="300" cy="150" rx="80" ry="120" /> </g> <g style="font-size: 15pt; font-weight: bold"> <text x="94" y="39"> X </text> <text x="295" y="21"> Y </text> </g> <g style="font-size: 16pt"> <text x="94" y="90"> 1 </text> <text x="94" y="150"> 2 </text> <text x="94" y="210"> 3 </text> <text x="295" y="70"> a </text> <text x="295" y="110"> b </text> <text x="295" y="150"> c </text> <text x="295" y="190"> d </text> <text x="295" y="230"> e </text> </g> <g style="stroke-width:2px;stroke:black;marker-end:url(#seta)"> <line x1="112" y1="82" x2="282" y2="102" /> <line x1="112" y1="142" x2="282" y2="106" /> <line x1="112" y1="202" x2="282" y2="152" /> <line x1="112" y1="202" x2="282" y2="187" /> </g> </svg>
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