So what did he mean by "richness"? Well, basically it refers to the number of galaxies there are within a cluster. Student: Is that the same as density? Professor: That's right. Both richness and density refer to the number per area. Rich clusters, or dense clusters, contain a relativ...
What does it mean to say rational numbers are dense? To say that the rationals are dense in the reals does not simply mean there is a rational between any two rationals; rather it means there is a rational between any two reals. That is a stronger statement, and takes more work to...
This sounds like a lot, but it is only about 0.3% of the mean Earth radius of 6371 km and is not the primary source of error in Eratosthenes’ calculations. 7:27 Are the riverboat merchants and the “grad student” the leading theories for how Eratosthenes measured the distance from ...
which is remarkable, considering the situation only a few years ago. In fact, it's so remarkable that provocative statements like this one: "Cancer is having a penicillin moment," people are saying, with these new immune therapy drugs. I mean, th...
It is a barren desert, or a dense forest, and you must choose a dense forest. Then there is the hesitation, let us all together consciously protect the environment, consciously protect the environment, consciously green environment, improve our living environment, create a bright future!
Deep learning is a subset of machine learning that uses multilayered neural networks, to simulate the complex decision-making power of the human brain.
What is testing if not verifying the quality of the object under test? But what does the word quality really mean? It is hard to define quality, but I will argue that a good operating definition is fitness for a function. In the world of software then, the question test should be ...
Anyway, the material flowing up from below the crust is more dense than the crust itself. So that's how we get a mascon, a spot in the crust with newer crust material that's more dense than the material all around it. There're lots of mascons on the moon too, where a mascon's ...
Unfortunately, water, as a liquid, doesn't have much structural integrity, so if the saturated soil is forced to compress too much too quickly, it will start to act like a liquid, and dense objects resting on the now liquefied soil will sink.不幸的是，水作为一种液体，没有足够的完整性...
This is particularly true over the past couple centuries as humanity exponentially tapped into dense forms of energy. Prior to that, our rate of productivity growth was much slower. For an example of productivity, people used to farm by hand. By harnessing the utility of work horses and ...