Closedworldlike

Closedworldlike is a term used to describe systems or environments that exhibit characteristics similar to a closed world assumption. The closed world assumption is a principle in logic and artificial intelligence that posits that anything not explicitly stated or derivable is false. In a closed worldlike system, information is considered complete within its defined boundaries. Any data or knowledge not present within the system is implicitly assumed to be non-existent or irrelevant to the system's operations or reasoning.

This characteristic can manifest in various ways. For instance, a database might operate under a closed worldlike assumption if it only returns results for queries based on the data it explicitly contains. If a record does not exist, the system will report that it cannot be found, rather than suggesting it might exist elsewhere or be unknown. Similarly, some expert systems or rule-based engines function by applying rules to a fixed set of facts. If a situation does not match any existing rules or facts, the system will not generate an output or will indicate an inability to resolve the situation based on its current knowledge.

The concept of closedworldlike systems is often contrasted with open world assumptions, where the absence of information does not imply its falsity. In an open world, unstated facts are considered unknown or potentially true. Closedworldlike systems prioritize consistency and certainty within their defined scope, making them predictable for tasks where completeness of information within that scope is guaranteed or assumed. However, this can also lead to limitations if the system's boundaries are too restrictive or if external information is crucial for accurate decision-making.