Mathematics is often presented as a neutral language of numbers, yet the ways in which ideas are recognised, interrogated, redesigned, and judged are deeply political. I synthesise critical pedagogy, Critical Mathematics Education, and decolonial scholarship to propose an epistemic-legitimation cycle with four stages. Through two vignettes: an ethnomathematics program in Panama and an illustrative design vignette on translanguaging in mathematics in China, I trace how we can enlarge credibility, render implicit assumptions visible, integrate multiple knowledge traditions in model building, and secure public validation for nonstandard proofs. Drawing on policy analyses, I show that curricular pluralism endures only when assessment frameworks and professional learning systems send a coherent epistemic signal. I conclude by reframing mathematics as a commons of plural knowledges and outlining a research agenda for measuring testimonial credibility and scaling dialogic, community embedded assessment.
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