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Reference.org
Fujikawa method
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<p>In <a href="/facts/Physics/a7aH2y08">physics</a>, Fujikawa's method is a way of deriving the <a href="/facts/Chiral_anomaly/xs7QFslR">chiral anomaly</a> in <a href="/facts/Quantum_field_theory/VoewsNJV">quantum field theory</a>. It uses the correspondence between <a href="/facts/Functional_determinant/preMcoEw">functional determinants</a> and the <a href="/facts/Partition_function_(quantum_field_theory)/T6VtrIo6">partition function</a>, effectively making use of the <a href="/facts/Atiyah%25E2%2580%2593Singer_index_theorem/qwcSxamI">Atiyah–Singer index theorem</a>. </p>