深夜发福利了 各种数学的符号说法
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[align="left"]这些你都知道吗？以后给老外作报告的时候可千万别再“The equation is like this…”, “The value is like this…”[/align][align="left"]有些公式不好写，能看出来什么意思就行了。[/align][align="left"]1.Logic[/align][align="left"]∃there exist[/align][align="left"]∀for all[/align][align="left"]p⇒q p implies q / if p, then q[/align][align="left"]p⇔q p if and only if q /p is equivalent to q / p and q are equivalent[/align][align="left"]2.Sets[/align][align="left"]x∈A x belongs to A / x is an element (or a member) of A[/align][align="left"]x∉A x does not belong to A / x is not an element (or a member) of A[/align][align="left"]A⊂B A is contained in B / A is a subset of B[/align][align="left"]A⊃B A contains B / B is a subset of A[/align][align="left"]A∩B A cap B / A meet B / A intersection B[/align][align="left"]A∪B A cup B / A join B / A union B[/align][align="left"]A\B A minus B / the diference between A and B[/align][align="left"]A×B A cross B / the cartesian product of A and B[/align][align="left"]3. Real numbers[/align][align="left"]x+1 x plus one[/align][align="left"]x-1 x minus one[/align][align="left"]x±1 x plus or minus one[/align][align="left"]xy xy / x multiplied by y[/align][align="left"](x-y)(x+y) x minus y, x plus y[/align][align="left"]= the equals sign[/align][align="left"]x=5 x equals 5 / x is equal to 5[/align][align="left"]x≠5 x (is) not equal to 5[/align][align="left"]x≡y x is equivalent to (or identical with) y[/align][align="left"]x>y x is greater than y[/align][align="left"]x≥y x is greater than or equal to y[/align][align="left"]x4. Linear algebra [/align][align="left"]‖x‖the norm (or modulus) of x[/align][align="left"]OA→OA / vector OA[/align][align="left"]OA¯ OA / the length of the segment OA[/align][align="left"]AT A transpose / the transpose of A[/align][align="left"]A−1 A inverse / the inverse of A[/align][align="left"]5. Functions[/align][align="left"]f(x) fx / f of x / the function f of x[/align][align="left"]f:S→T a function f from S to T[/align][align="left"]x→y x maps to y / x is sent (or mapped) to y[/align][align="left"]f’(x) f prime x / f dash x / the (first) derivative of f with respect to x[/align][align="left"]f”(x) f double-prime x / f double-dash x / the second derivative of f with respect to x[/align][align="left"]f”’(x) triple-prime x / f triple-dash x / the third derivative of f with respect to x[/align][align="left"]f (4) (x) f four x / the fourth derivative of f with respect to x[/align][align="left"]∂f/∂x1 the partial (derivative) of f with respect to x1[/align][align="left"]∂2f/∂x12 the second partial (derivative) of f with respect to x1[/align][align="left"]∫0∞ the integral from zero to infinity[/align][align="left"]limx→0the limit as x approaches zero[/align][align="left"]limx→0+the limit as x approaches zero from above[/align][align="left"]limx→0−the limit as x approaches zero from below[/align][align="left"]logey log y to the base e / log to the base e of y / natural log (of) y[/align][align="left"]lny log y to the base e / log to the base e of y / natural log (of) y[/align][align="left"] （转）[/align]
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