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We study quadratic forms on free modules with unique base, the situation thatarises in tropical algebra, and prove the analog of Witt's CancellationTheorem. Also, the tensor product of an indecomposable bilinear module $(U,\gamma)$ with an indecomposable quadratic module $(V,q) $ is indecomposable,with the exception of one case, where two indecomposable components arise.

Quadratic and Symmetric Bilinear Forms on Modules with Unique Base Over a Semiring