Definition:Linear Function of Two Variables/Mistake

Source Work

1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.)

2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.):

linear function

Mistake

A linear function of two variables has the form

$\map {\mathrm f} {x, y} = a_0 + a_1 x + a_2 y + a_3 x y$

where $a_0$, $a_1$, and $a_2$ are constants.

Correction

The text omits to mention that $a_3$ is also a constant.

Sources

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