### WP is stripping backslashes from $latex$ tags when copying posts

I’ve got a free blog hosted on wordpress.com. If I have a post with something like this: $latex \begin{bmatrix} 1 \\ -1 \end{bmatrix}$ And I copy the post, WP turns the block in the copied version into this: $latex begin{bmatrix} 1 \ -1 end{bmatrix}$ Notice the backslashes missing from begin, end and between the numbers.…

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