chondroma is a benign tumor which mostly occurs in extremities but also sometimes in brain. most intracranial chondromas arise from skull base, but chondroma of falx origin is a rare circumstance. indeed, the intracranial chondromas rise from falx is mostly in relation with syndromic disorders such as mafucci's syndrome or ollier's syndrome. here, we reported a rare case of falxian intracranial...

the energy of a graph is equal to the sum of the absolute values of its eigenvalues. two graphs of the same order are said to be equienergetic if their energies are equal. we point out the following two open problems for equienergetic graphs. (1) although it is known that there are numerous pairs of equienergetic, non-cospectral trees, it is not known how to systematically construct any such pa...

The energy of a graph is equal to the sum of the absolute values of its eigenvalues. Two graphs of the same order are said to be equienergetic if their energies are equal. We point out the following two open problems for equienergetic graphs. (1) Although it is known that there are numerous pairs of equienergetic, non-cospectral trees, it is not known how to systematically construct any such pa...

In 2005, Arnold Zwicky posited two misapprehensions about language: the Recency Illusion, or false idea that certain language variation is new, and Frequency erroneous belief a particular word phrase occurs often. Since their conception, these concepts have received widespread attention in popular scientific linguistics, but quantitative research investigating application scarce. The purpose of...