not simultaneously you're right . maths just comes from the first year of doing physics, analysis and linear algebra (I think its even considered as kleines nebenfach). Then physics is my bachelor. computational science is my master and I select my subject heavily into programming and thus I do many Informatik lectures but the degrees I hope to attain in the end are bsc in physics and msc in computational science. I do have a decent idea of the fields I mentioned though
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