From logicism to historicism,philosophers of science have put forward different standards of scientific demarcation according to their own scientific views.However,these standards encounter problems either in theory or in practice,and then fall into difficulties,thus moving towards relativism.Philosophy of scientific practice has reversed the previous image of science with scientific practice and pointed out the temporality,dynamics and locality of science.Therefore,the scientific boundary under this approach also has the above characteristics.Besides,the scientific boundary constructed by the scientific image is developmental and features temporary stability and effectiveness.Scientific demarcation is not a purely epistemological problem,but also a practical one.
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