"The mathematical constant pi is under threat from a group of detractors who will be marking "Tau Day" on Tuesday.

Tau Day revellers suggest a constant called tau should take its place: twice as large as pi, or about 6.28 - hence the 28 June celebration.

Tau proponents say that for many problems in maths, tau makes more sense and makes calculations easier.

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Dr Hartl is passionate about the effort, but even he is surprised by the fervent nature of some tau adherents.

"What's amazing is the 'conversion experience': people find themselves almost violently angry at pi. They feel like they've been lied to their whole lives, so it's amazing how many people express their displeasure with pi in the strongest possible terms - often involving profanity.

"I don't condone any actual violence - that would be really bizarre, wouldn't it?""

BBC News - 'Tau day' marked by opponents of maths constant pi"The mathematical constant pi is under threat from a group of detractors who will be marking "Tau Day" on Tuesday.Tau Day revellers suggest a constant called tau should take its place: twice as large as pi, or about 6.28 - hence the 28 June celebration.Tau proponents say that for many problems in maths, tau makes more sense and makes calculations easier...............Dr Hartl is passionate about the effort, but even he is surprised by the fervent nature of some tau adherents."What's amazing is the 'conversion experience': people find themselves almost violently angry at pi. They feel like they've been lied to their whole lives, so it's amazing how many people express their displeasure with pi in the strongest possible terms - often involving profanity."I don't condone any actual violence - that would be really bizarre, wouldn't it?""

Read a nice book on Maths problems once (or at least tried to) - specifically 23 problems set by Hilbert over a century ago. The book was interesting mainly cause it was apparent that most the matematicians were all crazy or driven by often petty demands for recognition or glory.debating tau versus pi seems to have more than a ring of crazy to it but maybe its a big deal if we could understand the impoirtance of it.