Absolute value of a difference in Simulink if block

I am trying to use the following inequality in my if block, which has two inputs: (u1 > 37) & (abs(u1 - u2) <= 1) However, I keep getting syntax errors. What is the correct way to write the absolute value in the Simulink if block?

Answer 1

[Jacob Ziesenis]

I am not sure what exactly you mean with an if-Block, but i would solve that problem in the following way: