780 PONTIFICIAE ACADEMIAE SCIENTIARVM SCRIPTA VARIA - 28 
so that from (222-4) 
(223-2) 
[TK (t+0)8(0)e Can ~1 
This condition can hold for all values of t only when K(t + 0) 
is independent of t+ 0, in which case we have 
(223-3) 
1 
“0 10 
“B(0)e 
K/ 
so that, from (220-1) 
(223-4) 
KE) amr 
whence it follows that 
223-5) 
o(t-0.0)_ Bl)" 
Eos 
As the right hand side is independent of #, it can be seen 
that ¢ is independent of # and invariant over time. Thus. 
222-6) 
Tie - 0, 0) = (0) 
11] Allais - pag. 84