The runtime precondition check rules out negative dimensions:
def makeZeroVector(size: Int): Node = {
  require(size >= 0)
  val h = new Node(0.0, size)
  h.prev = h
  h.next = h
  h
}
Both links point to the fresh list header, so all reciprocal-link conditions hold and there are no ordinary entries to violate ordering or nonzero-value requirements. The abstraction function therefore yields the zero vector of dimension size. Construction uses constant time and constant space.

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