Are carbon, hydrogen, oxygen, nitrogen necessary to what we shall define as life?

Entities in the same semantic neighborhood but without a typed relation to this one — candidates for new edges or unrecognized duplicates.

• What we call 'life' is a general condition which exists, to some degree or other, in every part of space: brick, stone, grass, river, painting, building, daffodil, human being, forest, city.quote0.762
  Verbatim statement of the fundamental hypothesis, defining the scope of life.
• What we call 'life' is a general condition which exists, to some degree or other, in every part of space... every connected region of space... has some degree of life, and that this degree of life is well defined, objectively existing, and measurable.hypothesis0.758
  The central predictive/causal hypothesis of the book, to be tested in later chapters.
• Any part of the world we build will have life if it is created by structure-preserving transformations, and will not have life if it is not created by structure-preserving transformations.claim0.756
  The central thesis of the chapter.
• The structures where life occurs just cannot be made in any other way.quote0.756
  Categorical assertion about the necessity of the living process.
• The structures where life occurs just cannot be made in any other way — it is a categorical and mathematical must.claim0.752
• What is an appropriate definition of 'life'?question0.752
  Background definitional challenge noted as notoriously difficult, motivating the paper's approach of updating 'machine' rather than defining 'life'
• There is nothing except the living structure of the world, and this living structure is all we need to reason with.claim0.748
  Radical assertion that function reduces to living structure, eliminating the need for external goals.
• Life requires only a boundary (Markov blanket), ergodicity, active inference capacity, and autopoiesis—not reproduction or DNA.claim0.748
  Reframes definition of life focusing on dynamical self-organization rather than genetic reproduction.