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3.MatrixAlgebra
Unitmatrices
zero,i.e.,(I)ij=Products
(AB)ij=lå k=1A ikBkjIngeneralAB6=BA.
Transposematrices
Inversematrices
(A1)ij=transposeofcofactorofAij jAjDeterminants
jAj=å
i,j,k,... ijk...A1iA2jA3k...22matrices
IfA=ab
cd then, jAj=adbcAT=ac
bd A 1=1 jAj db caProductrules
(AB...N)T=NT...BTAT jOrthogonalmatrices
matrixQ, Q1=QT,jQj=1,QTisalsoorthogonal.
5Solvingsetsoflinearsimultaneousequations
x=ATb.Hermitianmatrices
Eigenvaluesandeigenvectors
Theneigenvalues
)=jAIj.IfAisHermitianthentheeigenvalues matrixA.TrA=å
i i,alsojAj=Õ ii.IfSisasymmetricmatrix,
U TSU= andS=UUT. correspondingeigenvalue.Commutators
[A,B]ABBA [A,B]=[B,A] [A,B]y=[By,Ay] [A+B,C]=[A,C]+[B,C] [AB,C]=A[B,C]+[A,C]B [A,[B,C]]+[B,[C,A]]+[C,[A,B]]=0Hermitianalgebra
b y=(b 1,b2,...)
MatrixformOperatorformBra-ketform
HermiticitybAc=(Ab)cZ
O=Z (O )h jOjiEigenvalues,
realAui=(i)uiO i=(i) iOjii=ijiiOrthogonalityuiuj=0Z
i j=0hijji=0(i6=j)Completenessb=å
iu i(uib) i i Z i ij iihijiRayleigh-Ritz
Lowesteigenvalue
0bAbbb0Z
O Z h jOj i h j i 6Paulispinmatrices
x=01 10 ,y=0i i0 ,z=10 01 xy=iz,yz=ix,zx=iy,xx=yy=zz=I4.VectorCalculus
Notation
polarcoordinates =(r,,');incaseswithradialsymmetry=(r). areindependentfunctionsofx,y,z. 6 6 6 6 6 6 6 7 7 7 7 7 7 7 5 grad =r,divA=rA,curlA=rAIdentities
grad(1+2)grad1+grad2div(A1+A2)divA1+divA2
grad(12)1grad2+2grad1
curl(A1+A2)curlA1+curlA2 div(A)divA+(grad)A,curl(A)curlA+(grad)A
div(A1A2)A2curlA1A1curlA2 div(curlA)0,curl(grad )0 7Grad,Div,CurlandtheLaplacian
Conversionto
Cartesian
z=rcosDivergence
1 1 +1rsinCurlrA
ijk A xAyAz 1 bb'1 bz A A'Az 1 r2sinbr1rsinb1 rb'ArrArA'sin
Laplacian
r 2 1 +1 1 r +1r2sin sin 1 r2sin2Transformationofintegrals
S=asurfacearea
=avolumecontainedbyaspeciedsurface b t=theunittangenttoCatthepointP b n=theunitoutwardpointingnormalA=somevectorfunction
dL=thevectorelementofcurve(=btdL) dS=thevectorelementofsurface(=b ndS) ThenZ CAbtdL=Z
C AdL andwhenA=r Z C (r )dL=Z C dGauss'sTheorem(DivergenceTheorem)
WhenSdenesaclosedregionhavingavolume
Z (rA)d=Z S (Ab n)dS=Z S AdS also Z (r)d=Z SdSZ (rA)d=Z S (b nA)dS 8Stokes'sTheorem
WhenCisclosedandboundstheopensurfaceS,Z
S (rA)dS=Z C AdL also Z S (b nr )dS=Z CdLGreen'sTheorem
Z S rdS=Z r( r)d =Z r2+(r )(r)dGreen'sSecondTheorem
Z ( r2r2 )d=Z S [ (r)(r )]dS5.ComplexVariables
Complexnumbers
Thecomplexnumberz=x+iy=r(cos
realquantityristhemodulusofzandtheangle r(cos isin)=rei;zz=jzj2=x2+y2DeMoivre'stheorem
(cos +isin)n=ein=cosn+isinnPowerseriesforcomplexvariables.
e z=1+z+z22!++znn!+convergentforallnitez
sinz=zz33!+z55!convergentforallnitez
cosz=1z22!+z44!convergentforallnitez
ln(1+z)=zz22+z33principalvalueofln(1+z)
tan1z=zz3 3+z55 (1+z)n=1+nz+n(n1)2!z2+n(n1)(n2)3!z3+
96.TrigonometricFormulae
cos2A+sin2A=1sec2Atan2A=1cosec2Acot2A=11tan2A.
2 2 tan(AB)=tanAtanB1tanAtanBsinAcosB=sin(A+B)+sin(AB)2
sinA+sinB=2sinA+B2cosAB2
sinAsinB=2cosA+B2sinAB2
cosA+cosB=2cosA+B2cosAB2
cosAcosB=2sinA+B2sinAB2cos2A=1+cos2A
2 sin2A=1cos2A 2 cos3A=3cosA+cos3A 4 sin3A=3sinAsin3A 4 a a2=b2+c22bccosA
a=bcosC+ccosB cosA=b2+c2a2 2bc tanAB2=aba+bcotC2
area=1 sina sinA=sinbsinB=sincsinC cosa=cosbcosc+sinbsinccosA cosA=cosBcosC+sinBsinCcosa 107.HyperbolicFunctions
coshx=12(ex+ex)=1+x22!+x44!+validforallx
sinhx=12(exex)=x+x33!+x55!+validforallx
coshix=cosxcosix=coshx sinhix=isinxsinix=isinhx tanhx=sinhx coshxsechx=1coshx cothx=coshx sinhxcosechx=1sinhx cosh2xsinh2x=1Forlargepositivex:
coshxsinhx!ex 2 tanhx!1Forlargenegativex:
coshxsinhx!ex 2 tanhx!1Relationsofthefunctions
sinhx=sinh(x)sechx=sech(x) coshx=cosh(x)cosechx=cosech(x) tanhx=tanh(x)cothx=coth(x) sinhx=2tanh(x=2)1tanh2(x=2)=tanhxq
1tanh2xcoshx=1+tanh2(x=2)1tanh2(x=2)=1q
1tanh2x
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