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Let $S\subseteq \{0,\ldots,n\}^d$ be a set of $d$-dimensional vectors of with bounded, natural, coordinates. We are given that $$v'+v_1+\ldots+v_t=u'+u_1+\ldots+u_s$$ where $v_1,\ldots,v_t,u_1,\ldots,...

A partition regular system is a linear system of equations of the form $A\cdot x=0$, which satisfies a Ramsey-type result (namely, that for each $r>0$ whenever we colour the integers in $r$ classes,...