The Majority function is a computational function that determines the majority value among a set of input values. In the context of Boolean functions, the Majority function takes a certain number of binary inputs (typically 0s and 1s) and outputs the value that appears most frequently among the inputs.
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A majority Boolean function outputs one when more than half its input bits are one. An odd number of inputs avoids a tie convention. For three bits its unique multilinear polynomial is , so the polynomial method for quantum query lower bounds requires at least two exact queries.