Quadratic Form in Three Variables represents Conicoid

Theorem

A quadratic form in $3$ variables, when put equal to a constant, represents a conicoid.

Proof

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Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): form
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): form