Hi John, Yes a file was attached but it wasn't forwarded to the list. I don't know if that is possible. Anyway, here is that file. Bert
<dtbook><book> <div><math xmlns="http://www.w3.org/1998/Math/MathML"; display="block"><mtext>An equation</mtext><mstyle mathvariant="bold"><mi>w</mi></mstyle><mo>=</mo><msub><mi>α</mi><mn>1</mn></msub><msub><mstyle mathvariant="bold"><mi>v</mi></mstyle><mn>1</mn></msub><mo>+</mo><msub><mi>α</mi><mn>2</mn></msub><msub><mstyle mathvariant="bold"><mi>v</mi></mstyle><mn>2</mn></msub><mo>+</mo><msub><mi>α</mi><mn>3</mn></msub><msub><mstyle mathvariant="bold"><mi>v</mi></mstyle><mn>3</mn></msub></math></div> </book></dtbook>