Brard 
Equation (3.2) expresses that 
curl J (M) = V_, (M) - curl J. (M) when M describes D. ; (3. 8) 
and therefore entails 
Aa). oe ff», 209 a 0(M") = V_(M)-curl J,(M), MED 
yD (3. 9) 
curl ie (M) - curl J (no | = 0 within D. , 
ee 
< 
<} 
fy 
iS 
' 
Q 
far 
as 
(a 
ta 
iS 
SI 
| 
=/ 0: within D. ; 
the difference VE - curl J, is within D; the gradient of a harmonic 
potential, and, for (3.8) to be satisfied everywhere inside D,, it 
suffices that it be satisfied on ee ~ Cres: 
(3x 8) Aare 3), 08) 
1198 
