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The number of "arrangements" in an ordering of n items is given by either a combination (order is ignored) or a permutation (order is significant). An ordering (or order) is ...

A Boolean algebra is a mathematical structure that is similar to a Boolean ring, but that is defined using the meet and join operators instead of the usual addition and ...

The partial differential equation u_(xy)+(alphau_x-betau_y)/(x-y)=0.

The partial differential equation u_t=Du_(xx)+u-u^2.

The system of partial differential equations S_t=SxS_(xx).

The system of partial differential equations U_t=U·U_(xx)+U·LambdaU.

The partial differential equation u_(tt)-u_(xx)-u+u^3=0.

The partial differential equation u_(tt)-u_(xx)=epsilon(u_t-u_t^3).

The partial differential equation u_t+u_x-6uu_x-u_(txx)=0.

The partial differential equation u_(yy)=yu_(xx).