By Goursat E.

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**Extra resources for A course in mathematical analysis. - Derivatives and differentials**

**Sample text**

10) jm an expression of t h e fact t h a t the set of states \ j\m\j2m2 >and (for all allowed / ) span t h e same space. A n y state in a given set linear c o m b i n a t i o n of the states in the o t h e r set. 11) a useful relation in practice. As we saw [Eq. ( 3 . 13) mlj2 The relationship < / 1m 1/ 2m 2| / \ / 2/ m > = ( - l ) / l + / is of i m p o r t a n c e in applications. It implies t h a t w h e n coupling states, t h e order in which t h e y are w r i t t e n m a y affect t h e phase of t h e resultant s t a t e .

2 1 ) . We can express ( 3 . 2 4 ) in a m o r e c o m m o n f o r m if w e convert t h e V C coefficients i n t o 3-j s y m b o l s using ( 3 . 1 4 ) . 25) w h e r e we have used ( 2 . 2 2 ) . Notice t h a t t h e s u m of t h e m values of each 3-/ s y m b o l is z e r o , as it m u s t be b y ( 3 . 2 0 ) . 8 TWO U S E F U L INTEGRALS 9^>m^{oL$y) L e t us m u l t i p l y b o t h sides of ( 3 . 2 5 ) b y angles: a n d integrate over all t h e . C X J T ™'. '™. ' '"'™. ' ' ™'. '». ' ''' '''* s ) (o r)2 ( , jT)3 ), ( , ) sto - n r i w .

As we saw [Eq. ( 3 . 13) mlj2 The relationship < / 1m 1/ 2m 2| / \ / 2/ m > = ( - l ) / l + / is of i m p o r t a n c e in applications. It implies t h a t w h e n coupling states, t h e order in which t h e y are w r i t t e n m a y affect t h e phase of t h e resultant s t a t e . F o r e x a m p l e , the coupling of t h e states \\m) and \\m) t o give a state of / = \ , m = \ , can be w r i t t e n in t w o ways: U i i l > =* U i > l i -i> + UO>lH> 1/2 1/2 = Ci) m>li -i>-Ci) U0>iii> or l i i i i > = *

### A course in mathematical analysis. - Derivatives and differentials by Goursat E.

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