What is the difference between accessible, accessibilityLabel and accessibilityHint of Text component in react native?

What is the difference between accessible, accessibilityLabel and accessibilityHint of Text component in react native? The react native documentation is not enough to understand. Examples will be more appreciated.

Is there any difference between these two solutions for finding generating function?

Consider the following question.

Find the generating function for the number of integer solutions to the equation $ c_{1}+c_{2}+c_{3}+c_{4}=20$ where $ -3\leq c_{1}, -3 \leq c_{2}, -5\leq c_{3}\leq 5, $ and $ 0 \leq c_{4}$ .

  • The first solution: $ $ (c_{1} + 3)+(c_{2}+3)+(c_{3}+5)+c_{4}=20 + 3 + 3 + 5 \Rightarrow c_{1}’+c_{2}’+c_{3}’+c_{4}’=31 $ $ where $ 0\leq c_{1}’, 0 \leq c_{2}’, 0\leq c_{3}’\leq 10, $ and $ 0 \leq c_{4}’$ . The generation function is $ f(x) = (x^{0}+x^{1}+…)^{3}(x^{0}+x^{1}+…+x^{10})$ , and the number of integer solutions is the coefficient of $ x^{31}$ in $ f(x)$ .

  • The second solution (My solution): $ $ g(x) = (x^{-3}+x^{-2}+…+x^{3})^{2}(x^{-5}+x^{-4}+…+x^{5})(x^{0}+x^{1}+…)$ $ , and the number of integer solutions is the coefficient of $ x^{20}$ in $ g(x)$ .

My question: In the solution manual book, the presented solution is the first solution, but I think that the second solution is correct, and it is simpler than the first solution. Is my solution correct? What is the difference between these two solutions?

Database and table size shows large difference

I was running a materialized view refresh command in my postgres database. While the query was running it hit out of storage space and crashed with the following error.

psql:refresh.sql:1: FATAL:  terminating connection due to administrator command SSL connection has been closed unexpectedly psql:refresh.sql:1: connection to server was lost psql:refresh.sql:1: WARNING:  terminating connection because of crash of another server process DETAIL:  The postmaster has commanded this server process to roll back the current transaction and exit, because another server process exited abnormally and possibly corrupted shared memory. HINT:  In a moment you should be able to reconnect to the database and repeat your command. psql:refresh.sql:1: SSL SYSCALL error: EOF detected psql:refresh.sql:1: connection to server was lost psql:refresh.sql:9: ERROR:  could not write to hash-join temporary file: No space left on device 

I added additional storage to the database and did vacuum full but the storage that was used for the failed refresh ahs not been released. Currently my total table size is 183 Gib while database size is 375 Gib