nA matrix is called symmetric if:
AT = A
nA skew-symmetric matrix is one for
which:
AT = -A
nAn orthogonal matrix is one whose transpose is
also its inverse:
AT =
A-1
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Materials for Ballast
1. Broken Stones 2.Gravels 3.Cinders / Ashes 4.Sand 5.Kankar 6.Moorum 7. Brick Ballast
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