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I'm working with discret numbers (integers) and I'm looking for 4 sets of formulas to determine within which of these 4 triangles an $(x;y)$ point is, with $x \in [0;36[$ and $y \in [0;36[$.

Easier to understand with this

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    $\begingroup$ What have you done so far? $\endgroup$
    – saulspatz
    Oct 20 '19 at 0:18
  • $\begingroup$ So far I found (for the grid starting in the bottom left corner) x < 18 && y < 18 && x > y but it's only for the left part of the yellow triangle.. $\endgroup$ Oct 20 '19 at 0:29
  • $\begingroup$ Okay I found my out I'll post when I finish it $\endgroup$ Oct 20 '19 at 0:43
  • $\begingroup$ How do you deal with the points on the boundaries? Like $(1,0)$ or $(1,1)$. To which triangle do they belong? $\endgroup$
    – Andrei
    Oct 20 '19 at 1:13
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$$(x,y) \in {\rm red\ if}\ |y-x|> -1 \wedge |y+x| < 36$$

Can you continue?

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