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4
votes
3answers
270 views

How square is a square

I've recently heard the follwing sentence in a text for children learning English: The blackboard is square. It got translated to the German equivalent of “the blackboard is quadrilateral”. The ...
5
votes
3answers
6k views

Minimum of a negative value

What is the best way to call the smallest value (absolute value, |x|) of x if all x are negative? If we call it minimum, then it could be meaning the biggest absolute value... Addendum: I am ...
2
votes
1answer
582 views

What is the meaning of “they swim up a gradi­ent of nutrients”?

I could not figure out what the sentence shown in below means. What are the meanings of "as" and "they swim up a gradi­ent of nutrients"? Also what is the meaning of "gradient" in here? Even ...