Does !TeX => bad maths?

Whilst browsing the writeLaTeX twitter feed the other day, I came across an interesting observation that the absence of TeX is a good indicator that a math paper has issues, highlighted by John Cook (@TeXtip) in this tweet:

In the original blog post on this (entitled ‘Ten Signs a Claimed Mathematical Breakthrough is Wrong’), this is only one of a number of points made, although it is the first, and is accompanied by the interesting statistic that:

“This simple test (suggested by Dave Bacon) already catches at least 60% of wrong mathematical breakthroughs.”

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