real analysis proof baby shark plush toy verification elementary set theory proof writing asked 5 hours ago Quasar 1,66366 silver badges2020 bronze badges 0 votes 0answers 43 views Soft question Does this relation have a name. Posted by JSul Nov 23, 2019 25 0 0 0 Replies Last Activity: Nov 23, 2019 Paper jam Posted by Subhash2310 Nov 22, 2019 33 0 0 1 Reply Last Activity: Nov 23, 2019 by Mans Can I use 65 lb paper in my Envy 5055. Posted by Muzhik Nov 22, 2019 48 0 0 2 Replies Last Activity: Nov 23, 2019 by ShlomiL English Open Menu English Deutsch Español Français Português 中文 한국어 Didn't find what you were looking for. discrete mathematics elementary set theory proof writing asked 19 hours ago flolu 11344 bronze badges 3 votes 0answers 33 views Why is the following equation true. Please prove: $$(A \Delta B)\Delta C A \Delta (B\Delta C)$$ thanks discrete mathematics elementary set theory asked 23 hours ago SAMF 1722 bronze badges 2 votes 2answers 52 views The proof of the countability of a set Let a function $f: A \rightarrow R$ be defined on $A$ and have a local extremum at each non isolated point of this set.