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Relations, functions and equivalence
Relations as sets of pairs; reflexive, symmetric, transitive; functions and bijections.
A relation is a set of ordered pairs; an equivalence relation (reflexive, symmetric, transitive) partitions its set into classes; a function is a relation with exactly one output per input. Picture it: "same remainder mod 3" splits the integers into three columns. Think it: a bijection is how we say two sets have the same size, including infinite ones.
مثال · truth table of p implies q
Truth table of p implies q
قدم ب قدم
- p \Rightarrow q
2 variable(s) → 4 rows. Fill in every combination.
- \
Contingent: true for some inputs, false for others.
جواب کھوليں
اب آپ مسئلہ منتخب کريں يا ٹائپ کريں يا خود کريں ہر قدم ، تصوير ، جواب پوشيدہ هے جب تک آپ سوال نہ کريں
علامتیں
تمام تعريف کے ليے ، تصوير کے ليے اور اس ميں ہر حروف کا مطلب کے ليے کو ئي علامت کو ٹک کريں
کیسے: Relations, functions and equivalence
- 2 variable(s) → 4 rows. Fill in every combination.
- Contingent: true for some inputs, false for others.
سوالات لوگ پوچھتے ہیں
Are some infinities bigger than others?
Yes. The integers and the rationals can be listed; the real numbers cannot (Cantor's diagonal argument), so there are strictly more reals than integers.
What is the difference between a relation and a function?
A relation pairs inputs with outputs freely; a function is a relation in which every input gets exactly one output.
میں زیادہ Set Theory & Logic
Sets and operationsCardinality and infinityLogic and methods of proof