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## Main Question or Discussion Point

Supposed we are given a set of SUSY transformation law, the way to get the BPS equation is by requiring that

[tex] \delta \psi = 0 [/tex]

where [tex] \psi [/tex] is a fermion field.

Could somebody explain why this is the BPS equation?

Thanks!

[tex] \delta \psi = 0 [/tex]

where [tex] \psi [/tex] is a fermion field.

Could somebody explain why this is the BPS equation?

Thanks!