00613nam a2200229 a 450000500170000002000180001708200170003510000180005210000190007024500520008925000220014126000290016330000320019249000340022460000080025863000160026663000260028263000270030863000360033585600060037185600060037720251203114944.0  a9781493976294  a515.353bKOM  aKomech, A. I.  aKomech, Andrew  aPrinciples of partial differential equationsb_  a1st South Asia ed  aNew YorkbSpringerc2018  ax, 161 p.bill.c24 cm.bPB  aProblem books in mathematics.  bc_  aMathematics  aMathematical analysis  aDifferential equations  aDifferential equations, Partial  f_  a_