Do Op-Amps assume a Vcc and ground rail is connected though not shown?

When I included an op-amp in a circuit, can I assume that it has its supply voltage and ground so that if I make a circuit around it, I do not need to include any source of power? For example, will a LC tank or Colpitts oscillator work and will the simulation of it in time domain show oscillations?	by ProfBennett January 01, 2021
Colpitts op amp circuit	by ProfBennett January 01, 2021
The parts bin carries both a generic op-amp which assumes power supply and specific op-amps with power supply connections	by Foxx January 01, 2021

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Do Op-Amps assume a Vcc and ground rail is connected though not shown?

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