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It is documented within the function region_plot (and you can access directly the documentation of a function through question mark). To plot a region with an 'or' statement you must use the following

region_plot([lambda x,y: x < y or x < -y], (x,-1,1), (y, -1,1))

For an 'and' statement you have the choice between

region_plot([lambda x,y: x < y and x < -y], (x,-1,1), (y, -1,1))


region_plot([x < y,x < -y], (x,-1,1), (y, -1,1))