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Are the integers a group under addition? How about multiplication?

There are 4 things we need for a group: associativity, the existence of an identity, inverses in the group and closure. The integers are definitely associative under this operation as addition is associative...
DC
7320 Views

Quelles sont les éléments déclencheurs de l'antisémitisme en France Aujourd'hui ?

Bien que l'antisémitisme ne soit pas un sujet nouveau en France, les facteurs d'incitation essentiels dans l'actualité semblent être socio-politiques, culturels,et économiques.En fait, si dans le passé il ét...
AC
Answered by Arianna C. • French tutor
1601 Views

Why does a wire get hot when current flows through it?

Current is defined as the flow of electrons. This flow is caused by the electrons within the wire being pulled by electric field. As the electrons travel through the wire they collide with the atoms that mak...
Answered by • Physics tutor
34101 Views

Quali sono i vantaggi e gli svantaggi del frequentare l'università ?

Personalmente, penso che ci siano molteplici vantaggi legati all'educazione universitaria.Prima di tutto, ottenere un titolo di studio universitario permette di avere maggiori possibilità lavorative , oltre ...
AC
Answered by Arianna C. • Italian tutor
5556 Views

What is the derrivative (dy/dx) of the equation 2 = cos 4x - cos 2y in terms of x and y?

A common C4 question where the student would need to use implicit differentiation to obtain an equation with the derrivative in it. 0 = -4sin4x + 2(dy/dx)sin2y. Then all that is required is rearranging the e...
AY
Answered by Arsh Y. • Maths tutor
3647 Views