(medicine) An hereditary disease, characterized by a tendency to hemorrhage, and caused by a defect in blood platelet activity.

(computing) A computer that implements the von Neumann architecture. / (science fiction) Any machine that is capable of self-replication.

The effect that distinctive things are easier to remember

(quantum mechanics) The entropy of a quantum state. If the state is expressed as a quantum density matrix 𝜌, then this entropy can be expressed mathematically as S=-tr(𝜌 log 𝜌) where tr is the trace operator and the logarithm is natural.

(mathematics) A certain arithmetic function that is neither multiplicative nor additive. It is denoted by Λ(n) and defined as :𝛬(n)= log p mbox ifn=pᵏ mbox forsomeprimep mbox andintegerk>1,\0 mbox otherwise.

Neurofibromatosis type I.

(science fiction) A von Neumann machine, or machine capable of self-replication, that is sent on interstellar voyages to investigate or terraform.

plural of von Neumann machine

plural of von Neumann probe

plural of von Restorff effect