Equation 5.35 dimensionaly incorrect

[sannant]

thank for sharing this nice book on the web.

In section 5.5.5 Convenient formulas for P1 elements

fem-book/doc/.src/book/dotxt/varform.do.txt

Lines 5650 to 5656 in 4d4d5c2

	!bt
	\begin{equation}
	\basphi_I (x,y) = \half\Delta \left( \alpha_I + \beta_Ix
	+ \gamma_Iy\right),
	label{fem:approx:fe:2D:phi:I}
	\end{equation}
	!et

The formula for $\phi_I$ is dimensionaly incorrect. $\phi_I$ should have no unit and the right hand side has $[m^2]$. It should be $\frac{1}{2 \Delta}$ in the prefactor and not $\frac{1}{2 } \Delta$