The Impact Factor 2010 of scientific journals has been recently published. At present,

**IF**is considered as an important characteristic of scientific journals. But does it show anything?Recall that

**IF2010**of a journal “A” equals N/M where N is the number of citations in 2010 of articles published in “A” in 2008 – 2009 and M is the number of articles published in “A” in 2008 - 2009. For instance, if N=100 and M=100, then**IF**=1.000.I am a mathematical physicist. Therefore, let us look at the Table of

**IF2010**of journals in mathematical physics. The most authoritative journal in this area is*Communications in Mathematical Physics*. However, it occupies the 12^{th}position with**IF**=2.000 in comparison with the highest**IF**=3.144.It is readily observed that thin journals of about 50 articles in a year

*a priory*have advantages over the thick ones. At the same time, thick journals can widen their scope that gives an advantage over the specialized one. For instance, this is a recent practice of*Journal in Mathematical Physics*(**IF**=1.291) and*Journal of Physics A*(**IF**=1.641).**IF**of a journal in mathematical physics is higher than it is closer to applications and theoretical physics. In particular, the above mentioned

*Journal of Physics A*has

**IF**=1.641, whereas the theoretical journal

*Classical and Quantum Gravity*has

**IF**=3.098.

A problem is that only one well-cited article can essentially increase 2.000 in comparison with its usual value 1.000

**IF**of a journal during two years. For instance, in the example above, let a journal “A” in 2007 published an article quoted 101 times every year. Then its**IF**in 2008 and 2009 becomes equal toThis is the case of our 0.662 in 2007 and 0.757 in 2010.

*International Journal of Geometric Methods in Modern Physics*. One article on gravitation theory published in our Journal in 2007 and cited 491 times made its**IF2008**=1.464 and**IF2009**=1.612 in contrast with
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