View source for Energy inequality

An inequality that gives some estimate of the [[energy integral]].

====References====
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<TR><TD valign="top">[1]</TD> <TD valign="top">  S. Mizohata,   "The theory of partial differential equations" , Cambridge Univ. Press  (1973)  (Translated from Japanese)  {{MR|0599580}} {{ZBL|0263.35001}} </TD></TR>
<TR><TD valign="top">[a1]</TD> <TD valign="top">  R. Courant,   D. Hilbert,   "Methods of mathematical physics. Partial differential equations" , '''2''' , Interscience  (1965)  (Translated from German)  {{MR|0195654}} {{ZBL|}} </TD></TR>
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