00:01
Okay, very well.
00:02
Let's get started with one.
00:05
Well, the first one is true.
00:08
Indeed, if we have a, b, c equals 0, then what do we have? well, if we consider the vector lambda a, lambda b, and lambda c, which is lambda multiplied by a, b, c, then the brother.
00:30
Of these three coordinates is 0.
00:36
Indeed, the product is lambda cubed multiplied by a, b, c, and this one is 0.
00:43
That's why our subset of our 3 is closed under scalar multiplication.
00:52
Now for the second one, the second one is false.
00:57
Indeed, here we have an example...