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<pre style="white-space:pre-wrap;"><p style="font-family: "Lucida Grande"; white-space: normal; font-stretch: normal; line-height: 1.5; margin: 0px;">Thanks very much for your so quick reply.</p><p style="font-family: "Lucida Grande"; white-space: normal; font-stretch: normal; line-height: 1.5; margin: 0px;"><br style="font-family: "Lucida Grande", "Lucida Sans Unicode", sans-serif !important;"></p><p style="font-family: "Lucida Grande"; white-space: normal; font-stretch: normal; line-height: 1.5; margin: 0px;">Yes, my mistake, I actually mean <span style="font-family: "Lucida Grande", 微软雅黑; white-space: pre-wrap;">A^{abc}_{c} = A^{abcd} * g_{dc}</span></p><p style="font-family: "Lucida Grande"; white-space: normal; font-stretch: normal; line-height: 1.5; margin: 0px;"><span style="font-family: "Lucida Grande", 微软雅黑; white-space: pre-wrap;"><br style="font-family: "Lucida Grande", "Lucida Sans Unicode", sans-serif !important;"></span></p><p style="font-family: "Lucida Grande", "Lucida Sans Unicode", sans-serif; white-space: normal; font-stretch: normal; line-height: 1.5; margin: 0px;"><span style="white-space: pre-wrap;">So it goes back to my original post, it seems GiNaC will not produce a 0 result.</span></p><p style="font-family: "Lucida Grande", "Lucida Sans Unicode", sans-serif; white-space: normal; font-stretch: normal; line-height: 1.5; margin: 0px;"><span style="white-space: pre-wrap;"><br></span></p><p style="font-family: "Lucida Grande", "Lucida Sans Unicode", sans-serif; white-space: normal; font-stretch: normal; line-height: 1.5; margin: 0px;"><span style="white-space: pre-wrap;">Thanks again!</span></p><p style="font-family: "Lucida Grande", "Lucida Sans Unicode", sans-serif; white-space: normal; font-stretch: normal; line-height: 1.5; margin: 0px;"><span style="white-space: pre-wrap;"><br></span></p><p style="font-family: "Lucida Grande", "Lucida Sans Unicode", sans-serif; white-space: normal; font-stretch: normal; line-height: 1.5; margin: 0px;"><span style="white-space: pre-wrap;">Best Regards!</span></p><p style="font-family: "Lucida Grande", "Lucida Sans Unicode", sans-serif; white-space: normal; font-stretch: normal; line-height: 1.5; margin: 0px;"><span style="white-space: pre-wrap;">Feng</span></p>
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