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In article <DJrpGL.7JM@ulis.ac.jp> hiraga@ulis.ac.jp (Yuzuru Hiraga) writes:
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       $B"e(Ba $B!_(B $B"e(Bb = $B"e(B(a $B!_(B b)

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       -1 = i $B!_(B i  = $B"e(B(-1) $B!_(B $B"e(B(-1) =  $B"e(B{(-1) $B!_(B (-1)} = $B"e(B1 = 1

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