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Burka [1]
3 years ago
15

In the designation of wrought Al alloys, eg. 3m, what does the first digit-3- refer to? A. The main alloying element B. Carbon p

ercentage of the alloy C. Whether it is an ingot or a billet D. Specific alloy heat treatment
Engineering
1 answer:
andrew-mc [135]3 years ago
7 0

The first digit in the designation for wrought Al is the principal alloying element.

The answer is A.

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Let S = { p q |p, q are prime numbers greater than 0} and E = {0, −2, 2, −4, 4, −6, 6, · · · } be the set of even integers. . Pr
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prove that | S | = | E | ; every element of S there is an Image on E , while not every element on E has an image on S

Explanation:

Given that S = { p q |p, q are prime numbers greater than 0}

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To prove  by constructing a bijection from S to E

detailed  solution attached below

After the bijection :

<em>prove that | S | = | E |</em> :  every element of S there is an Image on E , while not every element on E has an image on S

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