Method-Pamphlets on the Milne Method of Numerical Integration of First- Order Differential Equations and of Certain Equations of Second Order.

1944 ◽  
Vol 51 (6) ◽  
pp. 340
Author(s):  
L. W. Cohen
Keyword(s):  
Differential Equations ◽  
Numerical Integration ◽  
Second Order ◽  
First Order ◽  
First Order Differential Equations

scholarly journals On pseudoelliptic systems of first order differential equations

1987 ◽  
Vol 108 ◽  
pp. 15-51 ◽  
Author(s):  
Kazushige Ueno
Keyword(s):  
Differential Equations ◽  
Finite Type ◽  
Differential Operators ◽  
Second Order ◽  
First Order ◽  
Elliptic Differential Operators ◽  
First Order Differential Equations

In the study of elliptic differential operators of second order, we found that the automorphism pseudogroups are of finite type ([4]). However this fact takes a complete change in elliptic differential operators of first order.So as to make the objects which can be dealt with clear, we introduce the concept of pseudoellipticity of first order differential operators (Definition 1.1), which is naturally satisfied by first order elliptic differential operators.

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