Minor beauty/consistensy fixes

[KronosTheLate]

No description provided.

[KronosTheLate]

Currently, the inverval is given by [t_0, t_f] in the start of the changed file. The subscript should probably consistently be letters or numbers. Also, if latex works (which I am not sure), the in was just missing a backslash, and that would look better than my proposed change.

[codecov]

Codecov Report

Merging #111 (fddbe27) into master (db7b972) will not change coverage.
The diff coverage is n/a.

❗ Current head fddbe27 differs from pull request most recent head 7dfe3db. Consider uploading reports for the commit 7dfe3db to get more accurate results

@@           Coverage Diff           @@
##           master     #111   +/-   ##
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  Coverage   83.62%   83.62%           
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  Files           5        5           
  Lines         226      226           
=======================================
  Hits          189      189           
  Misses         37       37           

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[KronosTheLate]

You just get things done, don't you ^_^
Thanks!