S Ananthanarayanan: Elections and the higher math

An individual's influence does matter, even in larger voting groups

The principle of "one person-one vote" is unquestionably fair and just. But in the groups that usually participate in voting, in national, international or even large company elections, this principle alone need not guarantee equality of "influence over decisions".  Using mathematics to analyse electoral systems leads us to some surprising conclusions.  Power of a voterIn an election where a decision is supported by 90 per cent of the voters, clearly, individual voters are not particularly important. But if the votes were equally split, then the individual vote becomes pivotal. ...