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This Concept Map, created with IHMC CmapTools, has information related to: ch11 time logi, logical time and logical clocks has instead of synchronizing clocks, event ordering can be used 1 if two events occured at the same process then they occurred in the order observed 2 when a message, m is sent between two processes, send(m) happened before receive(m) 3 the happened before relation is transitive the happened before relation is the relation of causal ordering, logical time and logical clocks has Lamports logical clocks a logical clock is monotonically increasing software counter. it need not relate to a physical clock. each process p1 has a logical clock, L1 which can be used to apply logical timestamps to events: L1 is incremented by 1 before each event at process p1