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Vertical Lines and an Extra Point at Infinity<br />

O<br />

P<br />

Add an extra point O “at infinity.”<br />

The point O lies on every vertical line.<br />

Q = –P<br />

Vertical lines have no<br />

The lack of shame involved third intersection in the theft of this point <strong>slide</strong> from Joe Silverman’s<br />

website should make any graduate student proud.

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