本文探讨了Mathematica中函数定义的区别，特别是即刻评估与延迟评估的不同之处。前者会在定义时立即计算表达式的右侧，而后者则是在每次调用时才进行计算。
f[x_]=x^2+1
f[x]=x^2+1
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f[x_]:=x^2+1
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The differences of the two is the previous is evaluate first
That is the RHS is evaluate first then assign it the LHS
but the later assignment is lazy which is say the equation is
evaluate when at the specific time before it just the symble equation
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