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Thank you for your post Bartman.
I don't understand the matrix particularities, but i will investigate them.

Hi all,
I just install Miktek and Texmaker on a new PC, and when i made a test to be sure all was working, I had the message quoted in the titel :
! LaTeX Error: File `tkz-obj-eu-draw-triangles.tex' not found.
On my last computer, I had a ancient version of Miktex and of Texmaker, and all was ...