- Gmail is searchable by size and year: size:10m older_than:1y.
It's a good option if you want to make some room in your Gmail for future.
- I typically use
Use Irfanview via the batch processing menu item under "File", selecting
advanced options in the dialog box ( www.irfanview.com ). Works great, and
you can over-write existing files OR re-direct the batch output to a
directory of your choice.
...one of the most popular viewers worldwide!
Definition — a precise and unambiguous description of the meaning of a mathematical term. It characterizes the meaning of a word by giving all the properties and only those properties that must be true.
Theorem — a mathematical statement that is proved using rigorous mathematical reasoning. In a mathematical paper, the term theorem is often reserved for the most important results.
Lemma — a minor result whose sole purpose is to help in proving a theorem. It is a stepping stone on the path to proving a theorem. Very occasionally lemmas can take on a life of their own (Zorn’s lemma, Urysohn’s lemma, Burnside’s lemma, Sperner’s lemma).
Corollary — a result in which the (usually short) proof relies heavily on a given theorem (we often say that “this is a corollary of Theorem A”).
Proposition — a proved and often interesting result, but generally less important than a theorem.
Claim — an assertion that is then proved. It is often used like an informal lemma.
Axiom/Postulate — a statement that is assumed to be true without proof. These are the basic building blocks from which all theorems are proved (Euclid’s five postulates,Zermelo-Fraenkel axioms, Peano axioms).
Paradox — a statement that can be shown, using a given set of axioms and definitions, to be both true and false. Paradoxes are often used to show the inconsistencies in a flawed theory (Russell’s paradox). The term paradox is often used informally to describe a surprising or counterintuitive result that follows from a given set of rules (Banach-Tarski paradox, Alabama paradox, Gabriel’s horn).
PROF. DAVE RICHESON