# Annihilation operators of two different types of Fermions

Tanmoy
Moved from a technical form
IfA=cd, where c and d are
annihilation operators of two different types of Fermions, then {A,A°}is?
A.1+n1+n2
B.1-n1+n2
C.1-n2+n1
D.1-n1-n2
Where,n1 and n2 are corresponding number operator,
A° means A dagger or creation operator,as the particles are fermions they will obey anti-commutation I think

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Homework Helper
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Welcome to PF. We ask posters to show some work first.
What have you tried?
By the way, what is n1 and h2 in terms of creation/annihilation operators?

Tanmoy
Welcome to PF. We ask posters to show some work first.
What have you tried?
By the way, what is n1 and h2 in terms of creation/annihilation operators?
n1=c°c
n2=d°d
° means dagger

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