Hadamard's maximal determinant problem: what is the largest determinant of a matrix with entries all equal to 1 or −1? Hilbert's fifteenth problem: put Schubert calculus on a rigorous foundation. Hilbert's …

mystery, problem, enigma, riddle, puzzle mean something which baffles or perplexes. mystery applies to what cannot be fully understood by reason or less strictly to whatever resists or defies explanation. …

PROBLEM definition: 1. a situation, person, or thing that needs attention and needs to be dealt with or solved: 2. a…. Learn more.

1. Difficult to deal with or control: a problem child. 2. Dealing with a moral or social problem: a problem play.

A difficulty that has to be resolved or dealt with. She's leaving because she faced numerous problems to do with racism. The word "problem" is correct and can be used in written English. You can use it …

Problem definition: A question to be considered, solved, or answered.

any question or matter involving doubt or difficulty: has financial and emotional problems. a statement requiring a solution, usually by means of mathematical operations: simple problems in addition. …

Apr 22, 2025 · Identify your problem by outlining what you already know about it, uncovering the information you're still missing, and finally, researching the missing information.

There are nine meanings listed in OED's entry for the noun problem, three of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

4 days ago · The perfume industry is facing a major problem: maintaining constant levels of quality is crucial, but it is increasingly difficult to obtain a regular supply of all the necessary natural ingredients.