Formal Modelling of PBFT Consensus Algorithm in Event-B

Listing 4

Event ‘Primary_change’.

Event Primary_change

  Where

   @grd1 pre∉corr

   @grd2 NODES∖Pre_set≠∅

  Then

   @act1 pre≔max(NODES∖Pre_set)

   @act2 Pre_change≔TRUE

End