Dumitru Enescu is not a widely recognized name in popular culture or history based on my training data. It could refer to a specific individual, perhaps in a regional context or a lesser-known figure. It could also be a name of a business or organization.

Giuseppe Mercalli (1850–1914) was an Italian volcanologist and priest who is best known for developing the Mercalli intensity scale, which measures the effects of an earthquake based on observations and experiences of people in the affected areas. Unlike the Richter scale, which quantifies the energy released by an earthquake, the Mercalli scale is qualitative and assesses the impact of the earthquake, including damage to buildings, changes in the landscape, and human perceptions.

Raymundo Punongbayan (1939–2019) was a prominent Filipino geologist and public servant known for his contributions to the field of geology, particularly in the study of volcanic eruptions and disaster risk reduction in the Philippines. He served as the director of the Philippine Institute of Volcanology and Seismology (PHIVOLCS), where he played a pivotal role in monitoring volcanic activities and providing early warning systems to mitigate the impact of natural disasters.

Anya Reading could refer to a specific character or a situation involving someone named Anya who is reading a book or engaging in a literary activity. However, without more context, it's difficult to provide a precise answer.

Dorthe Dahl-Jensen is a prominent Danish glaciologist and climate scientist known for her research on ice core drilling, glaciology, and climate change. She has made significant contributions to our understanding of past climate variations through her studies of ice cores, particularly from Greenland, which provide insights into historical atmospheric conditions and greenhouse gas concentrations. Dahl-Jensen has been involved in various international research projects and collaborations, significantly contributing to the field of paleoclimate research.

As of my last knowledge update in October 2021, there isn't a widely recognized figure or entity named Inés Cifuentes in popular historical, cultural, or public domains. It's possible that Inés Cifuentes could refer to a private individual, a professional in a specific field, or a fictional character that has emerged after that date.

It seems that there might be a mix-up or a misunderstanding, as "Mariah Carbone" does not appear to refer to any widely recognized public figure, event, or topic as of my last training cut-off in October 2023. It is possible that it could be a private individual or a less-known entity not covered in mainstream sources.

This is the possibly infinite dimensional version of a Hermitian matrix, since linear operators are the possibly infinite dimensional version of matrices.

There's a catch though: now we don't have explicit matrix indices here however in general, the generalized definition is shown at: en.wikipedia.org/w/index.php?title=Hermitian_adjoint&oldid=1032475701#Definition_for_bounded_operators_between_Hilbert_spaces

A good definition is that the sparse matrix has non-zero entries proportional the number of rows. Therefore this is Big O notation less than something that has $N^2$ non zero entries. Of course, this only makes sense when generalizing to larger and larger matrices, otherwise we could take the constant of proportionality very high for one specific matrix.

Of course, this only makes sense when generalizing to larger and larger matrices, otherwise we could take the constant of proportionality very high for one specific matrix.

Forms a normal subgroup of the general linear group.

Forms a normal subgroup of the general linear group.

The normal navigation to them was paywalled, but the static files are served without login checks if you know their URL. One way to go about it is to search by prefix on the Wayback Machine: web.archive.org/web/*/https://www2.physics.ox.ac.uk/sites/default/files/contentblock/2011/06/03/*

The last handbooks we can find are 2020/2021, they might have move to a new more properly paywalled location after that year.