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What does opposite angle brackets <> mean?

Example 1

forall x,y in set {1,…,5} & X <> y => not m.temps(x) = m.temps(y)

Example 2

exists i,j in set inds m.temps & i <> j and m.temps(i) > 400 and m.temps(j) > 400

What does <> in those sentences mean?

Solution

  • It just means "not equal to". So "x <> y" is the same as "not x = y".