If you need to answer those questions then read the book again then answer the questions. What helps me is to reread the page or passage again
Answer:
Each conservation law of a given partial differential equation is determined (up to equivalence) by a function known as the characteristic. This function is used to find conservation laws, to prove equivalence between conservation laws, and to prove the converse of Noether's Theorem.
Explanation:
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Travelling is a great way of spending your time because it enrichens your personal experience. If you travel with a tourist agency (or even if you travel without one) you're helping the tourism of a certain area/country. With helping them, you're also creating more money for them which means they can invest more money into creating even more desirable touristic adventures. This circle can then be repeated multiple times :)
