3.33.3 Can you answer these questions?

Can you answer these?

3.33.3.1 How to remove vertical space when subequations are used along with empheq?

https://tex.stackexchange.com/questions/392431/how-to-remove-vertical-space-when-subequations-are-used-along-with-empheq

I am using empheq along with subequations as given in the MWE. However, the use of subequations create a vertical space between the paragraph and equation as shown in figure, which I don't want. I  ...
 

- asked by nxkryptor 1vote

3.33.3.2 Creative Commons: "Public Domain Mark" icon

https://tex.stackexchange.com/questions/392264/creative-commons-public-domain-mark-icon

Is there a symbol available in Latex indicating "Public Domain Mark"? See wiki or creative commons so what I'm looking for is this symbol: 
So far I used the ccicons package but it seams that this  ...
 

- asked by user1234 3votes

3.33.3.3 Where does not TeX make correct spacing and formatting in math formulas automatically?

https://tex.stackexchange.com/questions/392329/where-does-not-tex-make-correct-spacing-and-formatting-in-math-formulas-automati

I am writing book with a lot of math formulas. I am interested to print them correctly according to typography rules, Knuth's recommendations or AMS-society's recommendations. 
I saw in this question  ...
 

- asked by Dida 2votes

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