( 750 ) 
It is then evident that for two of the singular points the differences 
of the exponents are equal, so that besides the ordinary substitution 
of order one also substitutions of order two as 
0 —1 +1 0 oost 
E 
PE an BN Beal dt BE Nen 
' B t a 1 8 
: a 2 2 
and 
0 —l +1 0" ert 
a DI a 
Pe ee ot) (US. Zale, = Ue oe ae 
| ! B 3' a 1 3! 
a t 9 2 t 
are possible. 
The indicated reduction runs as follows: 
0 oo 0 
b? z b? 
ne Daf Ng ee he 0 —h 1 ee (ye 
a | a? 
| —v —v—h 2v+142h 
0 oo if 
h 
OC oe ee 
a | 2 2 a 
| é BE 
| D= 3 WW 2 p+ + 
| 0 al +1 
h 
Bf Ob \e aap h h teh 
=27(-) es 0 ee 
a 2 a’? + 5? 
h h 
2 heh. > 
p+1+ Y 5 Y 5 
| 0) ore) 1 
Di: 
bel 
= 
= 
