**Anton Akhmerov**
(4530ca00)
*
at
22 Apr 21:06
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rename sqrt_hop -> T_xn, use that it is never None

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146 more commits
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**Anton Akhmerov**
(9fa841f2)
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at
21 Apr 16:08
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allow using monochromatic scans

**Anton Akhmerov**
(06a9696a)
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at
21 Apr 16:08
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allow using monochromatic scans

You're right, returning `None`

is a more intuitive interface for indicating that the learner isn't ready.

Indeed, I agree.

Fair enough, if we want to make it easily modifiable we can expose it separately.

Maybe 1e-8 is a better default?

Something like that, yes.

Yes, that's a very relevant observation. I believe the appropriate way to fix it is a more advanced loss function. The most straightforward solution would be to set the loss of an interval to 0 once `\delta x`

becomes smaller than some minimal length.

I got a complaint from a student. He made a 10 pages exam, but it was not very easy to oversee the whole exam. He gave as tip to hand out an additional paper with all the questions listed (so a regular exam). I don't know whether you think this is a good idea as well, but maybe you can make a tool that provides an extra paper with all questions on it when printing.

Indeed, already now the organization of exam is outside of zesje's control. @VvTP please refer the students directly to the course teams if they have suggestions about specific layouts.

**Anton Akhmerov**
(9eed2f75)
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at
15 Apr 12:12
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use a correct arrow for logical causality

fixed

Hi,

There is a minor error in the lecture notes which was already remarked during the lecture. When considering the magnetisation of a spin J we obtain Both in the numerator and denominator, we are missing the LandÃ© factor g in the exponential. Also, analogously to the spin 1/2 equation, we are missing a minus sign in front of the numerator. This is due to the fact that a positive spin (m_j>0) gives a negative magnetic moment (see footnote 15 in section 4.3).

Best regards

**Anton Akhmerov**
(d40bf8e5)
*
at
15 Apr 11:32
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another sign error (closes #14)

Thanks, fixed!

Hi,

When calculating the magnetisation M of a spin 1/2 particle, we obtain However, the middle part is not equal to a tanh, but -tanh. Using the more formal definition of magnetisation M = -n\frac{dF}{dB}, we also obtain tanh. Therefore we are clearly missing a minus sign in the middle term of the above equation. This can be explained by the fact that, using our definition of the Zeeman hamiltonian without the minus sign, a spin up has a magnetic moment of -\mu_B and a spin down +\mu_B. In the middle term of the above equation, the prefactors -\mu_B and +\mu_B in front of the Boltzmann distributions in the numerator should thus be interchanged, indeed resulting once again in a tanh.

Best regards

**Anton Akhmerov**
(db82edab)
*
at
15 Apr 11:28
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typo fix (closes #13)

**Anton Akhmerov**
(e315c754)
*
at
14 Apr 23:23
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add copyright and license