reductionism is incorrectly written and should be written as "reductionism, reductionism" being its meaning:
I think that they wanted to say reductionism, though you could use reductionism, as reductive materialism is the philosophical current. Reductionism is the philosophical approach according to which the reduction is necessary and sufficient to solve various problems of knowledge. Since the reduction, an epistemic operation, you can practice on different objects, the reductionist strategy constitutes, in fact, a set of gnoseológicas, methodological and ontological thesis about the relationship between different ideas or scientific fields.
