Reciprocity theorem

Reciprocity theorem could refer to one of several completely different results.

In pure mathematics:

• Quadratic reciprocity, a theorem about modular arithmetic, along with several generalizations:
  • cubic reciprocity
  • quartic reciprocity
  • Artin reciprocity
  • Weil reciprocity for algebraic curves
• Frobenius reciprocity theorem for group representations.

In physics:

• Reciprocity (electromagnetism), theorems relating sources and the resulting fields in classical electromagnetism
• Tellegen's theorem, a theorem about the transfer function of passive networks

• Reciprocity (mathematics)