<?xml version="1.0"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN""http://www.w3.org/TR/MathML2/dtd/xhtml-math11-f.dtd"><html xmlns="http://www.w3.org/1999/xhtml">  <head>    <title>ara-4.xml</title>     </head><body><p>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<msup>
<mo> <mover accent="false"> <mo> <mi>b</mi> </mo> <mo> &RightArrow; </mo> </mover>  </mo> <mo>  </mo> 
</msup> <mo>=</mo>
<mrow> <mo> ( </mo>   <mtable>
<mtr>
<mtd> <msub>
<mo> <mi>b</mi> </mo> <mo> <mn>1</mn> <mo/>
</msub></mtd>
</mtr>
<mtr>
<mtd> <msub>
<mo> <mi>b</mi> </mo> <mo> <mn>2</mn> <mo/>
</msub></mtd>
</mtr>
</mtable>  <mo> ) </mo> </mrow>   <mo>=</mo>
 <msub>
<mo> G </mo> <mo> <mi>i</mi><mi>j</mi> <mo/>
</msub> <mi>a</mi> 
<!-- ]|Expr|[#b @`b___})*# b$L$^<c$%!^" *~: ;bP9&c55*b}__ ,]<c!$1^|
|["! ^$^b^1_^$^b^2_}};bP8 ,];bP9 $^G(!ij}_;bP8 ;bP9a|
|}& b!( b"0 b#8 b$@ b%H b&P!WW}]|[ -->
</math>
</p></body></html>