Once more unto the breach Updated 2025-07-16
On the Law of Distribution of Energy in the Normal Spectrum Updated 2025-07-16
The Planck's law paper.
Ain't Nobody Got Time For That Updated 2025-07-16
Fractional quantum Hall effect for Updated 2025-07-16
Fractional quantum Hall effect for Updated 2025-07-16
Matrix exponential Updated 2025-07-16
Is the solution to a system of linear ordinary differential equations, the exponential function is just a 1-dimensional subcase.
Note that more generally, the matrix exponential can be defined on any ring.
The matrix exponential is of particular interest in the study of Lie groups, because in the case of the Lie algebra of a matrix Lie group, it provides the correct exponential map.
Algebraic equation Updated 2025-07-16
Algebraic number Updated 2025-07-16
China Central Television Updated 2025-07-16
Chinese book Updated 2025-07-16
Create a test user in PostgreSQL Updated 2025-07-16
In order to create a test user with password instead of peer authentication, let's create test user:
createuser -P user0
createdb user0-P makes it prompt for the users password.Alternatively, to create the password non-interactively stackoverflow.com/questions/42419559/postgres-createuser-with-password-from-terminal:Can't find a way using the
psql -c "create role NewRole with login password 'secret'"createuser helper.We can then login with that password with:which asks for the password we've just set, because the
psql -U user0 -h localhost-h option turns off peer authentication, and turns off password authentication.The password can be given non-interactively as shown at stackoverflow.com/questions/6405127/how-do-i-specify-a-password-to-psql-non-interactively with the
PGPASSWORD environment variable:PGPASSWORD=a psql -U user0 -h localhostNow let's create a test database which
user0 can access with an existing superuser account:createdb user0db0
psql -c 'GRANT ALL PRIVILEGES ON DATABASE user0db0 TO user0'We can check this permission with:which now contains:The permission letters are explained at:
psql -c '\l' List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
-----------+----------+----------+-------------+-------------+-----------------------
user0db0 | ciro | UTF8 | en_GB.UTF-8 | en_GB.UTF-8 | =Tc/ciro +
| | | | | ciro=CTc/ciro +
| | | | | user0=CTc/cirouser0 can now do the usual table operations on that table:PGPASSWORD=a psql -U user0 -h localhost user0db0 -c 'CREATE TABLE table0 (int0 INT, char0 CHAR(16));'
PGPASSWORD=a psql -U user0 -h localhost user0db0 -c "INSERT INTO table0 (int0, char0) VALUES (2, 'two'), (3, 'three'), (5, 'five'), (7, 'seven');"
PGPASSWORD=a psql -U user0 -h localhost user0db0 -c 'SELECT * FROM table0;' Crowdsourcing website Updated 2025-07-16
Indian classical musician Updated 2025-07-16
Raga by time of the day Updated 2025-07-16
Robert Noyce: The Man Behind the Microchip by Leslie Berlin (2006) Updated 2025-07-16
Borrow from the Internet Archive for free: archive.org/details/manbehindmicroc000berl/page/n445/mode/2up
Algorithm Updated 2025-07-16
Alibaba Updated 2025-07-16
Alibaba Cloud Updated 2025-07-16
A linear map is a (1,1) tensor Updated 2025-07-16
Allele Updated 2025-07-16
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