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The basic objects of NIntegrate are integration regions. Each region has its own integration function and integration rule. In order to interpret the printed trace it is helpful to know that NIntegate uses the software design patterns Strategy, Composite, Decorator, and others.

The basic objects of NIntegrate are integration regions. Each region has its own integration function and integration rule. In order to interpret the printed trace it is helpful to know that NIntegrate uses the software design patterns Strategy, Composite, Decorator, and others.

(Thanks to Michael E2 for prompting these explanations.)

(Thanks to Michael E2 for prompting these explanations.)

UPDATE 2 (IntegrationMonitor methods)

UPDATE 2 (IntegrationMonitor methods)

(Thanks to Michael E2 for prompting these explanations.)