Correct technical language: .h headers do not »define«, they »declare«

Core/Algorithms/Beam.h

Core/Algorithms/ChiSquaredModule.h

Core/Algorithms/ConvolutionDetectorResolution.h

Core/Algorithms/DWBADiffuseReflection.h

Core/Algorithms/DWBASimulation.h

Core/Algorithms/DecoratedLayerDWBASimulation.h

Core/Algorithms/DecouplingApproximationStrategy.h

Core/Algorithms/DetectorMask.h

Core/Algorithms/DistributionHandler.h

Core/Algorithms/Distributions.h

Core/Algorithms/FTDecayFunctions.h

Core/Algorithms/FTDistributions.h

Core/Algorithms/FitElement.h

Core/Algorithms/GISASSimulation.h

Core/Algorithms/IChiSquaredModule.h

Core/Algorithms/IDetector2D.h

Core/Algorithms/IDetectorResolution.h

Core/Algorithms/IIntensityFunction.h

Core/Algorithms/IIntensityNormalizer.h

Core/Algorithms/IInterferenceFunctionStrategy.h