Study f-biharmonic and bi-f-harmonic submanifolds in complex and Sasakian space forms.
problem Characterize f-biharmonic and bi-f-harmonic submanifolds in complex and Sasakian space forms.
method Prove necessary and sufficient conditions for f-biharmonicity and bi-f-harmonicity in general and specific cases.
result Obtain non-existence results for f-biharmonic and bi-f-harmonic submanifolds.