Can ๐ผ_๐‘ฅ๐‘ฆ = ๐ผ_๐‘ฆ๐‘ฅ be valid in the moment of inertia of the XM430-W350?

Hello,

I was reviewing the โ€œmoment of inertia.pdfโ€ for the XM430 and noticed something unusual, so I am writing to ask for clarification.

As far as I know, in the inertia tensor, the relationships should be <I_xy = - I_yx>, <I_yz = - I_zy>, and <I_zx = - I_xz>. However, in the document, these values are shown as the same, rather than being the negative of each other.

Is this a typographical error, or is there a specific reason for this?

Thank you.

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Link: https://www.robotis.com/service/download.php?no=717