This paper examines the epistemological foundations of Mathematical Knowledge for Teaching Teachers (MKTT) and argues that persistent challenges in mathematics teacher education reflect deeper philosophical tensions rather than mere pedagogical deficiencies. Drawing on established frameworks for Mathematical Knowledge for Teaching, the paper analyzes what is termed the “recursion problem”: teaching teachers requires specialized second-order pedagogical knowledge that remains poorly theorized and institutionally under-supported. Five interconnected epistemological tensions are identified: the measurement problem, which privileges quantifiable knowledge while marginalizing practical wisdom and tacit knowing; the individualization of knowledge, which treats knowledge as individual property rather than recognizing its fundamentally relational nature; theory-practice separation in research methodologies; cultural epistemology tensions between universalizing frameworks and epistemological pluralism; and power dynamics that determine what counts as legitimate teacher knowledge. These tensions illuminate why implementation gaps prove resistant to conventional pedagogical solutions. Meaningful progress requires philosophical reconstruction: reconceptualizing teacher knowledge as situated, relational, and culturally embedded; developing research methodologies that honor the integrated nature of knowledge-in-practice; and acknowledging epistemological pluralism while grappling with questions of power and legitimation. This examination contributes to philosophy of mathematics, epistemology, and applied ethics by demonstrating how educational practice raises fundamental questions about the nature and constitution of professional expertise.
KeywordsEpistemologyMathematical Knowledge for Teaching TeachersPhilosophy of MathematicsSocial EpistemologyTeacher Education
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