31. This, too, is the action of the electromagnetic force, together with the Pauli exclusion principle . 32. Following the Pauli exclusion principle , there can be only one fermion occupying each quantum state. 33. The Pauli exclusion principle gives rise to exchange interactions. 34. The Pauli Exclusion Principle is a quantum-mechanical effect. 35. The motivation for introducing dual numbers into physics follows from the Pauli exclusion principle for fermions. 36. An energy associated with the Pauli exclusion principle . 37. The inclusion-exclusion principle is sometimes attributed to da Silva, which was included in an 1854 publication. 38. In general, the inclusion-exclusion principle is false. 39. When electrons are squeezed together too closely, the exclusion principle requires them to have different energy levels. 40. According to the competitive exclusion principle , species less suited to compete for resources should either die out.