The belief in that characterized the modern age is one of the major assumptions overturned in the postmodern age.

The belief in "Convergence"

Explanation:

Postmodernism is described as a school of thought distinguished by its difference with modernism. Modern age thoughts considers ideals such as progress, objectivity, rationality, and other ideas that could be derived from convergence and enlightenment, as very important ideals. However postmodernism questions if such ideals even exists.

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explanation:

may i ask what challenges?