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/sci/ Science & Math

Threads added between 2015/09/16 and 2015/09/23

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Most viewed threads in this category

8 more posts in this thread. [Missing image file: ]
Has anyone here completed the Actuary exams? How hard are they and what material is covered? I am considering the field as an option for income.

Constructing the entries of a Hessian matrix of a function with non-independent variables.

2 more posts in this thread. [Missing image file: ]
I'm a bit confused about what the entries of the Hessian actually represent. Suppose I have a function f with an input vector of x variables f ( \bar{x} ), but these x_1, x_2) ... x_n are not independent and they are related by the function: x_1 + x_2 + x_3 +... = 1 So, now take for example the first entry of the Hessian in pic related. Should this simply be the second derivative of f with respect to x_1 with all other x values kept constant. OR should I should I substitute x_2 using the relation then find the second derivative of f with respect to x_1 and while keeping all x values that are not x_1 or x_2 constant (this makes the most geometric sense to me, since both x_1 and x_2 are changing along a line where everything else is kept constant; only x_1 doesn't make physical sense to me because the other x values are not independent and should be changing. OR should I be finding the total derivative? The total derivative does not make much sense to because we're trying to find the change of the function in the x_1 right? So not the total change. Does anyone have any textbooks or other resources they'd recommend to me? I'm not exactly sure what field this is even in, but I'm very interested in optimization using Hessian matrices.

studying habits

1 more posts in this thread. [Missing image file: ]
Me? I just really pay attention in class and take short notes...evening before I go out I just read the days note. Plus I really try to understand it. Hence no need to cram! Trick is not to let it pile up, do the shit your supposed to do on the right time How about you?

Algebra by Gelfand and Shen

3 more posts in this thread. [Missing image file: ]
Does anyone have a PDF? I cannot find this shit anywhere.
13 more posts in this thread. [Missing image file: ]
How the hell do you people enjoy labs? I want to learn principles, not apply them to articificial little microcosms. I understand the usefulmess of the skill, and I understand how labs could be fulfilling for someone actually pooling new data, but a sterile, insignificant classroom lab? How is this anything but mindlessly following instructions?


1 more posts in this thread. [Missing image file: ]
What Engineering discipline is objectively superior (in terms of job prospects, pay, working conditions, how many dicks sucked a day etc.)
1 more posts in this thread. [Missing image file: ]
No one really still believes in the naturally selected Jew, right? Evolution lacks so much evidence. Fossil record? No sign of fossils from the transitional species.
34 more posts in this thread. [Missing image file: ]
What do you write with?
3 more posts in this thread. [Missing image file: ]
U donte need math 4 fisics
29 more posts in this thread. [Missing image file: ]
This image shows signal to noise ratio of human BOLD-MRI data (commonly known as fMRI) projected onto the cortical surface. High values mean good signal quality, low values mean poor signal quality. Notice the blue spots on the ventral (bottom) frontal lobe and on the temporal lobe. Those are brain regions directly over the nasal and ear cavities. Those cavities are transition zones from high density (skull, brain) to low density (air), which cause eddy currents in the magnetic field, and consequent signal loss. This figure won't end up in a paper, so I figured I'd share it with you guys. Neuroscience general.

Chemistry demonstrations

39 more posts in this thread. [Missing image file: ]
Hey /sci, I need some neat chemical reactions for demonstration purposes at my local high school. Do you guys have any suggestions?
18 more posts in this thread. [Missing image file: ]
Why do we teach students to be specialists rather than generalists? For example, von Neumann was a generalist who contributed to computer science, economics, physics, pure mathematics, and mathematical statistics and was an expert in all five fields.
3 more posts in this thread. [Missing image file: ]
Can You Solve My Cypher ? :)
8 more posts in this thread. [Missing image file: ]
Why are people in the UK so ugly while in Australia they aren't? Aren't they both from the same gene pool? Serious question
17 more posts in this thread. [Missing image file: ]
Would it be possible to not have to eat if you just had nutrified blood hooked up to you from a camelbak of sorts? Could you live like that?
52 more posts in this thread. [Missing image file: ]
Can get fuel melt steel beams? I know this sounds like a meme post but I actually want to know.
59 more posts in this thread. [Missing image file: ]
How do you feel about Chemistry?
72 more posts in this thread. [Missing image file: ]
>tfw can't understand anything at all in physics Why did you lie /sci/? You said physics was fun and interesting, but I'm in Physics II and none of it is remotely interesting and I can't understand any of it, and it doesn't make any sense. Now I'm going to fail the first test on Friday and there goes my hopes of getting at least a B in the class so I can put it behind me and never do it over again.


181 more posts in this thread. [Missing image file: ]
In 3 or less statements prove that human races do not exist.

Ph.D General Experiences/Stories

96 more posts in this thread. [Missing image file: ]
Anyone have interesting stories about their Ph.D career? What is your area of study? Are you finished? Do you regret doing it? What will you do when you finish? Also Ph.D general q/a.

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