Abdul Hamid KARA
School of Mathematics,
University of the Witwatersrand,
P Bag 3 Wits,
2050 Johannesburg,
E-mail: kara@maths.wits.ac.za

Symmetries, conservation laws and "partial" Lagrangians

We show how one can construct conservation laws of Euler-Lagrange-type equations via Noether-type symmetries associated with partial Lagrangians. This is
particularly of significance when a differential equation is not derivable from a variational priciple, for e.g., scalar evolution equations.