Artificial systems inherently have a major defect: they must be premised on one or more fundamental assumptions upon which additional knowledge is built.{{clarify|date=June 2019|reason = Needs clearer explanation. e.g., what are the fundamental assumptions involved in a hammer, or a refrigerator. What makes a man-made dam system different from a beaver dam in this context?}}{{citation needed|date = June 2019}} These fundamental assumptions are not inherently deleterious, but they must by definition be assumed as true, and if they are actually false then the system is not as structurally integral as is assumed. For example, in [[geometry]] this is very evident in the postulation of [[theorem]]s and extrapolation of proofs from them. | Artificial systems inherently have a major defect: they must be premised on one or more fundamental assumptions upon which additional knowledge is built.{{clarify|date=June 2019|reason = Needs clearer explanation. e.g., what are the fundamental assumptions involved in a hammer, or a refrigerator. What makes a man-made dam system different from a beaver dam in this context?}}{{citation needed|date = June 2019}} These fundamental assumptions are not inherently deleterious, but they must by definition be assumed as true, and if they are actually false then the system is not as structurally integral as is assumed. For example, in [[geometry]] this is very evident in the postulation of [[theorem]]s and extrapolation of proofs from them. |